JP2023121840A - Electronic device, calculation support method and program - Google Patents

Abstract

To provide a computer capable of displaying a numerical value related to tax calculation and a numerical value related to normal calculation on a display part by changing over between them based on a same operation, calculation method and program.SOLUTION: A computer executes: a first calculation using numerical values in response to an input of an execution instruction for the first calculation, causes a first memory to store a first numerical value related to a result of the executed first calculation and causes a display part to display it; executes a second calculation using numerical values in response to an input of an execution instruction for the second calculation different from the first calculation, causes a second memory to store a second numerical value related to a result of the executed second calculation and causes the display part to display it; when a first readout instruction is input while displaying the numerical value representing the result of the executed first calculation on the display part, causes the display part to display the first numerical value stored in the first memory; and when the first readout instruction is input while displaying the numerical value representing the result of the executed second calculation on the display part, causes the display part to display the second numerical value stored in the second memory.SELECTED DRAWING: Figure 4

Description

The present invention relates to a calculator, calculation method, and program for tax calculation.

Some tax calculators (calculators) in recent years have a function of performing tax calculation using a preset tax rate. For example, the calculator described in Patent Document 1 performs arbitrary four arithmetic calculations, displays a numerical value (amount) to be multiplied, and operates the tax-included key (confirmation key) to display the displayed numerical value. Calculate and display the tax-inclusive amount based on the first tax rate. Similarly, when the tax-inclusive key (confirmation key) is operated again, the tax-inclusive amount is calculated and displayed based on the second tax rate in the displayed numerical value.

In addition, the tax calculator described in Cited Document 2 has multiple tax calculation keys (tax-inclusive calculation key, tax-excluded calculation key) corresponding to multiple tax rates, and a dedicated key for calculating the total amount including tax ( Tax calculation total key) and is provided. Depending on the operation of each tax calculation key, the tax calculator calculates the tax-inclusive amount based on the tax rate corresponding to each tax calculation key, based on the numerical value normally calculated by arbitrary four arithmetic calculations, etc., or based on the individually input numerical value. Calculate and display. Furthermore, the total tax amount calculated based on each of the plurality of tax rates is calculated and displayed.

JP-A-10-143472 JP 2017-174225 A

Conventionally, a second calculation different from the first calculation (for example, It is not known to display a second number associated with the result of a normal calculation (eg, the grand total of the normal calculation). If a key for displaying the first numerical value and a key for displaying the second numerical value are separately provided in the key input section, the space for these two keys is occupied.

The present invention has been made in consideration of the above problems, and is a calculator, a calculation method, and a calculator capable of displaying a numerical value related to a first calculation and a numerical value related to a second calculation on a display unit based on the same operation. and to provide programs.

In order to solve the above problems, the computer of the present invention executes a first calculation using numerical values in response to an input of an execution instruction for the first calculation, and performs a first calculation related to the result of the executed first calculation. storing numerical values in a first memory and displaying them on a display unit; executing a second calculation using the numerical values in response to an input of an instruction to execute a second calculation different from the first calculation; 2 storing a second numerical value related to the result of the calculation in a second memory and displaying it on the display unit; and performing a first reading instruction while the numerical value indicating the result of the executed first calculation is being displayed on the display unit. is input, the first numerical value stored in the first memory is displayed on the display unit, and while the numerical value indicating the result of the executed second calculation is being displayed on the display unit, the The control unit displays the second numerical value stored in the second memory on the display unit when a first readout instruction is input.

According to the present invention, the numerical value related to the first calculation and the numerical value related to the second calculation can be displayed on the display unit based on the same operation.

1 is a front view showing the external configuration of a tax calculator according to the present embodiment; FIG. FIG. 2 is a block diagram showing the configuration of the electronic circuit of the calculator according to the embodiment; 4 is a flowchart for explaining the operation of the tax calculation function of the calculator according to the embodiment; 4 is a flowchart for explaining the operation of the tax calculation function of the calculator according to the embodiment; 4 is a flowchart for explaining the operation of the tax calculation function of the calculator according to the embodiment; 4 is a flowchart for explaining the operation of the tax calculation function of the calculator according to the embodiment; 4 is a flowchart for explaining the operation of the tax calculation function of the calculator according to the embodiment; FIG. 5 is a diagram showing a specific example of input operation and display for explaining the tax calculation function of the calculator according to the present embodiment; FIG. 5 is a diagram showing a specific example of input operation and display for explaining the tax calculation function of the calculator according to the present embodiment; FIG. 5 is a diagram showing a specific example of input operation and display for explaining the tax calculation function of the calculator according to the present embodiment; FIG. 5 is a diagram showing a specific example of input operation and display for explaining the tax calculation function of the calculator according to the present embodiment; The figure which shows an example of the slip format used in an Indian retail store.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view showing the external configuration of the tax calculator according to this embodiment. In this embodiment, the tax calculator is implemented as a calculator 10 dedicated to calculation.

In addition to being configured as the calculator 10, the tax calculator includes a personal computer having a calculation function (on which a calculation processing program is implemented), a tablet computer, a smartphone, a mobile phone, a touch panel type PDA (personal digital assistant), an e-book, It can be configured as a portable game machine or the like. A tax calculator that does not have physical keys (buttons) such as the calculator 10 displays a software keyboard similar to the keys of the calculator 10, and executes calculation processing according to key operations on the software keyboard. .

The calculator 10 according to the present embodiment is provided with a tax calculation function for tax calculation based on a plurality of tax rates, for example, five tax rates. For example, India uses five tax rates (0%, 5%, 12%, 18%, and 28%) as consumption tax. Therefore, the calculator 10 according to the present embodiment is suitable for tax calculation for calculating the total amount of goods subject to a plurality of consumption taxes of up to five types, for example, in India.

A key input unit 11 including a plurality of keys, a display unit 12 and a solar panel 13 are provided on the front of the housing of the calculator 10 . The key input unit 11 is provided with numeric keys, operation keys, tax calculation function keys, function keys, and calculation function keys. Numerical keys include, for example, a plurality of keys corresponding respectively to [00][0]-[9]. Operation keys include, for example, [+] (addition) key 11h1, [-] (subtraction) key 11h2, [×] (multiplication) key 11h3, and [÷] (division) key 11h4, which are used for normal calculations by the four arithmetic operations. , [=] (calculation execution) key 11h0.

The tax calculation function keys include a tax calculation key ([GST+n (TAX-n)]) 11b, a tax calculation total key ([GST GT (GT)]) 11c, and a tax calculation mode switching key ([GST+/TAX-]). 11d is provided. Here, GST is an abbreviation for "Goods and Service Tax" which means consumption tax in India. In addition, the character strings in [ ] (excluding the character strings in ( )) indicate the character strings printed on the key top of each tax calculation key 11b. indicates the character string printed on the front of the housing of the calculator 10 for the sake of convenience. In this specification, the same notation is used not only for the tax calculation key 11b.

Tax calculation key ([GST+n (TAX-n)]) 11b includes tax 0 calculation key ([GST+0 (TAX-0)]) 11b0, tax 1 calculation key ([GST+1 (TAX-1)]) 11b1, tax 2 calculation key ([GST+2 (TAX-2)]) 11b2, tax 3 calculation key ([GST+3 (TAX-3)]) 11b3, and tax 4 calculation key ([GST+4 (TAX-4)]) 11b4. A tax 0 calculation key ([GST+0 (TAX-0)]) 11b0 is operated to input an instruction to execute tax calculation using a tax rate of 0. Similarly, tax 1 calculation key ([GST+1 (TAX-1)]) 11b1, tax 2 calculation key ([GST+2 (TAX-2)]) 11b2, tax 3 calculation key ([GST+3 (TAX-3)]) 11b3, Tax 4 calculation key ([GST+4 (TAX-4)]) 11b4 is operated to input instructions for tax calculation using tax rate 1, tax rate 2, tax rate 3, and tax rate 4, respectively. In this specification, when representing the tax calculation key ([GST+n(TAX-n)]) 11b, "n" is used in place of each numerical value from 0 to 4. In this specification, not limited to the tax calculation key 11b, out of all possible numeric values (integers from 0 to 4) that "n" can take, if there is no particular limitation as to which numeric value it is, a specific numeric value For the sake of convenience, explanation will be made using “n” instead of “n”.

One tax calculation key 11b (tax n calculation keys 11b0 to 11b4) serves both as a tax-included calculation key [GST+n] and a tax-excluded calculation key [TAX-n]. The tax calculation key 11b (tax n calculation keys 11b0 to 11b4) is used to select the tax calculation key [GST+n] or the tax calculation key [GST+n] or Used as tax-excluded calculation key [TAX-n]. By sharing one tax calculation key 11b as a tax-inclusive calculation key [GST+n] and a tax-excluded calculation key [TAX-n], it is possible to effectively utilize the limited front area of the housing, and use multiple (5 types) A key is provided for executing tax-inclusive calculation processing and tax-excluded calculation processing corresponding to each tax rate.

The tax rates (tax rate 0 to tax rate 4) assigned to the tax calculation keys 11b (tax n calculation keys 11b0 to 11b4) are set in advance when the calculator 10 is shipped from the factory. For example, five types of tax rates (0%, 5%, 12%, 18%, 28%) are set for the tax n calculation keys 11b0 to 11b4, respectively, according to use in India. Also, the tax rates (tax rate 0 to tax rate 4) assigned to the tax n calculation keys 11b0 to 11b4 can be arbitrarily set by user operation.

The tax calculation total key ([GST GT (GT)]) 11c is a grand total key ([GT] key) for displaying the grand total of normal calculations (basic calculations) such as four arithmetic calculations and constant calculations, and a tax calculation key ([GT] key). Also serves as a GST grand total key ([GST GT] key) for displaying the total sum of the calculation results of . When the tax calculation total key 11c functions as the GST grand total key, tax calculation is executed and the processing mode of the calculator 10 transitions to the tax total recall mode (GST GT recall mode). On the other hand, when the tax calculation total key 11c functions as the grand total key, the processing mode of the calculator 10 does not change in particular, but simply the numerical value stored in the total memory area 22h is called and displayed on the display unit 12. be done. These processes will be described later in detail with reference to FIG.

The tax calculation total key 11c functions as either a grand total key ([GT] key) or a GST grand total key ([GST GT] key) depending on the operation state immediately before the tax calculation total key 11c is operated. do. Specifically, when the processing mode of the calculator 10 is not the total tax recall mode, for example, immediately after the tax calculation is executed by operating the tax calculation key 11b, that is, after the tax calculation is executed, the executed tax calculation is executed. When the tax calculation total key 11c is pressed while the results are being displayed on the display unit 12, the tax calculation key 11b serves as a GST grand total key ([GST GT] key) for displaying the total of the tax calculation results. ). Also, when the processing mode of the calculator 10 is not the total tax recall mode, for example, immediately after the normal calculation is executed by operating the calculation execution key ([=] key) 11h0, that is, after the execution of the normal calculation, the If the tax calculation total key 11c is pressed while the result of the normal calculation is being displayed on the display unit 12, that is, if it is not immediately after the tax calculation is executed by operating the tax calculation key 11b, the tax calculation key 11b , functions as a grand total key ([GT] key) for displaying the grand total for normal calculations (basic calculations). Note that the pressing time of the tax calculation total key 11c here is shorter than any predetermined time, and shorter than the "long pressing" described below. Further, in this specification, pressing for a short period of time is referred to as a "short press" or a normal pressing operation for the sake of convenience.

Furthermore, the tax calculation total key 11c functions as a key opposite to the above-described key when an operation (for example, a long press) different from a normal pressing operation is performed. That is, for example, when the tax calculation total key 11c is pressed for a long time immediately after tax calculation is executed by operating the tax calculation key 11b, the tax calculation total key 11c functions as a grand total key ([GT] key). Function. Further, for example, when the tax calculation total key 11c is pressed for a long time immediately after normal calculation is executed by operating the operation execution key ([=] key) 11h0, that is, tax calculation is executed by operating the tax calculation key 11b. Otherwise, the tax calculation total key 11c functions as a GST grand total key ([GST GT] key). It should be noted that an operation other than the above-described long-pressing operation (an operation of continuing to press the tax calculation total key 11c for at least the above-mentioned predetermined arbitrary time) can be used as an operation different from the normal operation on the tax calculation total key 11c. is.

Function keys include, for example, an all clear key ([AC] key 11a), a clear key ([C] key), a plurality of memory keys ([MRC] [M-] [M+]), a root key ([√] key ), [%] key 11g, and the like. The [%] key 11g is used for percentage calculation and also for setting the tax rate corresponding to each of the tax calculation keys 11b (tax n calculation keys 11b0 to 11b4) to a value input by key operation. Used to trigger the configuration process.

The calculation verification function key is a key used in the calculation verification function for confirming/correcting the details of the previously executed calculation. The check function keys include check keys ([CHECK BACK] key 11e, [CHECK FORWARD] key 11f) and correction keys ([CORRECT] key) 11k. The [CHECK BACK] key 11e and the [CHECK FORWARD] key 11f are keys for switching and displaying the contents of previously executed calculations (calculation data) step by step. When the [CHECK BACK] key 11e is operated, the display is switched to the calculation data of the step with the smaller number of steps, and when the [CHECK FORWARD] key 11f is operated, the display is switched to the calculation data of the step with the larger number of steps Switch display. It should be noted that the unit of one step is "numerical value + function" input for calculation. "Function" stores codes of keys operated for four arithmetic calculations, tax-inclusive calculations, tax-excluded calculations, and the like. The correction key 11k is a key for instructing correction of the contents of the calculation ("number + function") displayed by operating the [CHECK BACK] key 11e or the [CHECK FORWARD] key 11f. By inputting the content of the calculation after correction after operating the correction key 11k, the previously input calculation data displayed can be corrected.

The round selector 11y sets a calculation method for rounding. For example, the "F" setting specifies display of the maximum number of digits that can be displayed on the display 12, including decimal places. The "CUT" setting specifies truncation of the digit specified by the decimal point selector 11z. The "UP" setting specifies rounding up the digit specified by the decimal point selector 11z. The "5/4" setting specifies rounding off of the digit specified by the decimal point selector 11z. The decimal point selector 11z sets the number of digits below the decimal point to be displayed on the display unit 12 . The "ADD2" setting designates the decimal point setting to a predetermined number of digits for the input numerical value.

The display unit 12 is composed of a dot-matrix liquid crystal display unit. The display unit 12 displays numerical values input by operating the keys of the key input unit 11 . Numerical values for a limited number of lines (for example, one line) are displayed on the display unit 12 . In addition, characters and symbols indicating the currently set calculation mode and various setting states are displayed in the state display areas provided along the sides of the display unit 12 . For example, the number of steps 12a, tax calculation mode symbol 12b, tax calculation key symbol 12c, tax total recall mode symbol 12d, total total display symbol 12e, memory symbol 12f, and the like are displayed in the status display area. In FIG. 1, in order to explain the state display area, all the symbols that can be displayed are shown on the same screen for convenience. They are not always displayed on the screen at the same time.

The number of steps 12a indicates the position of the current step to be displayed, with one step being "number + function" input by operating the keys of the key input unit 11 . The tax calculation mode symbol 12b indicates the current tax calculation mode. displays [TAX-], for example.

The tax calculation key symbol 12c is a symbol indicating the tax rate used for tax calculation and either tax-inclusive calculation or tax-excluded calculation when tax calculation is executed by operating the tax calculation key 11b. When the tax calculation key 11b is used as the tax-inclusive calculation key [GST+n], one of [GST+0], [GST+1], [GST+2], [GST+3], and [GST+4] corresponding to tax rates 0 to 4 is displayed. be done. Also, when the tax calculation key 11b is used as the tax exclusion calculation key [TAX-n], [TAX-0], [TAX-1], [TAX-2], [ Either [TAX-3] or [TAX-4] is displayed.

The total tax recall mode symbol 12d is a symbol indicating that the total tax recall mode (GST GT recall mode) has been entered by operating the total tax calculation key ([GST GT (GT)]) 11c. Is displayed. In the tax total recall mode, according to the key operation of the tax calculation total key 11c, the total tax amount calculated at each tax rate (tax rate 0 to 4) is displayed as the total tax amount, the tax total amount, and the total tax amount. The frame can be switched and displayed. In the tax total recall mode, the tax rate (tax rate 0 to 4) to be displayed is specified by key operation on the tax calculation key 11b, and the total amount including tax and the total amount excluding tax are displayed as the total tax calculation for each specified tax rate. The amount and the total tax amount can be switched and displayed.

The total total display symbol 12e is a symbol indicating that the calculation result of the normal calculation performed in response to the operation of the calculation execution key [=] 11h0 is stored in the total memory area 22h. For example, "GT" is displayed. be. The memory symbol 12f is a symbol indicating that a numerical value is stored by the memory function according to the operation of the memory keys ([M-] [M+]).

The solar panel 13 generates power when the illuminance of the surrounding environment light when using the calculator 10 is bright to some extent. The solar panel 13 functions as a power supply section 26 (shown in FIG. 2) of the calculator 10 during power generation, and supplies power to each section of the calculator 10 . Further, when the solar panel 13 is not generating power, power is supplied to each part of the calculator 10 from a primary battery as a power supply part 26 separately provided in the calculator 10 .

FIG. 2 is a block diagram showing the configuration of the electronic circuit of the calculator 10 according to this embodiment. The electronic circuit of calculator 10 includes a plurality of units, including CPU 21, that constitute a computer.

The CPU 21 executes a calculation processing program 22a stored in the memory 22 to control the operation of each section of the circuit. When an input operation to the key input unit 11 is performed, the CPU 21 detects the key for which the input operation was performed based on the key input signal from the key input unit 11, and executes various calculation processes according to each detected key. do. In the calculator 10, the CPU 21 controls the operation of each part of the circuit in accordance with the instructions written in the calculation processing program 22a, and the software and hardware cooperate to operate, thereby performing processing by the calculation function described in the following explanation of the operation. Realize calculation processing including.

The calculation processing program 22a may be stored in advance in the memory 22, read from an external recording medium 23 such as a memory card via the recording medium reading section 24, or communicated via the communication section 25. It may be downloaded from a server 30 on network N (including the Internet, etc.).

In addition to storing a calculation processing program 22a, the memory 22 includes an area (tax memory) for storing calculation results of tax calculation, a total memory area 22h, a total tax recall mode area 22k, a tax calculation mode area 22m, and a buffer memory. Areas for storing various data such as an area 22n, a display memory area 22p, and a tax rate storage area 22r are provided. The tax memory (first memory) includes a tax rate 0 total memory area 22b, a tax rate 1 total memory area 22c, a tax rate 2 total memory area 22d, a tax rate 3 total memory area 22e, a tax rate 4 total memory area 22f, and a tax total memory area 22g. is included. In the following description, the tax rate 0 total memory area 22b, the tax rate 1 total memory area 22c, the tax rate 2 total memory area 22d, the tax rate 3 total memory area 22e, and the tax rate 4 total memory area 22f are collectively referred to as the tax total by tax rate. They may be described as memory areas 22b to 22f.

The zero tax rate total memory area 22b is an area for storing data calculated by tax calculation based on the zero tax rate. The zero tax rate total memory area 22b stores a numerical value based on the result of the zero tax rate tax calculation. Specifically, the tax-inclusive amount (0th tax-inclusive amount), the tax amount (0th tax-inclusive amount), and the Each total amount of tax-excluded amount (0th tax-excluded amount) is stored as the 0th tax-excluded total amount, the 0th tax-excluded total amount, and the 0th tax-exclusive amount, respectively.

The tax rate 1 total memory area 22c, the tax rate 2 total memory area 22d, the tax rate 3 total memory area 22e, and the tax rate 4 total memory area 22f are based on the respective tax rates 1 to 4 in the same manner as the tax rate 0 total memory area 22b. This is an area for storing data calculated by tax calculation. Detailed description is omitted.

The tax total memory area 22g is an area for storing data indicating the total of numerical values calculated by tax calculation based on all tax rates 0-4. In the tax total memory area 22g, the tax-included total amount obtained by summing the 0th to 4th tax-included total amounts, the tax-included total amount corresponding to the tax-included total amount, and the tax-included total amount corresponding to the tax calculation total key 11c are input. A tax total amount corresponding to the total total amount is stored.

The total memory area 22h is an area (second memory) for storing data indicating the sum of numerical values calculated by normal calculation. In the total memory area 22h, the calculation result of the normal calculation is calculated according to the operation of the operation execution key [=] 11h0, and the numerical value as the calculation result is added to the numerical value stored in the total memory area 22h. .

In the total tax recall mode area 22k, a total tax recall mode flag indicating whether the recall mode is set is set to an ON state or an OFF state in response to an input operation on the tax calculation total key 11c. The tax total recall mode is turned on when the tax calculation total key 11c is pressed immediately after tax calculation by operating the tax calculation key 11b, or when the tax calculation total key 11c is long-pressed immediately after normal calculation. (transition to tax total recall mode). The total tax recall mode is turned off when, for example, the [AC] key 11a is operated as a predetermined instruction for turning off the total tax recall mode. The on/off switching of the tax total recall mode is not limited to the operation of the tax calculation total key 11c and the [AC] key 11a. For example, on/off of the total tax recall mode may be switched according to another key operation or according to the processing result of the calculator 10 .

When the tax total recall mode is on, each time the tax calculation total key 11c is operated (depressed), the total tax-included total, total tax-excluded total, and total tax total stored in the tax total memory area 22g are displayed. The amount can be switched and displayed. When the tax total recall mode is on, each time the tax calculation key 11b (tax n calculation keys 11b0 to 11b4) is operated (depressed), the tax total by tax rate memory areas 22b to 22f are stored. , the total amount including tax, the total amount excluding tax, and the total amount including tax can be switched and displayed.

The ON state of the total tax recall mode is maintained even when input is made with the numeric keys and operation keys of the key input unit 11 . Therefore, normal calculation using the numerical keys and operation keys can be executed while the tax calculation results are displayed and confirmed by the input operation of the tax calculation total key 11c or the tax calculation keys 11b (11b0 to 11b4). In the normal calculation in the ON state of the tax total recall mode, the numerical value resulting from the tax calculation can be displayed on the display unit 12, and the four arithmetic operations can be performed on the numerical values displayed on the display unit 12. .

The tax calculation mode area 22m stores tax calculation mode data indicating whether the mode is a tax-inclusive calculation mode or a tax-excluded calculation mode, which is switched according to an input operation on the tax calculation mode switching key 11d.

The buffer memory area 22n stores the input numbers that form a unit together with the last input function. The display memory area 22p stores the numerical value displayed on the display unit 12 at that time. For example, when the number "100" as a numeric key and the tax 1 calculation key ([GST+1 (TAX-1)]) 11b1 as a function are sequentially operated by operating the numeric keys, the numeric value is stored in the buffer memory area 22n as In the display memory area 22p, the numerical value "105" displayed on the display section 12 is stored as the result of the tax-inclusive calculation of the tax rate 1 (however, the tax rate 1 is assumed to be 5%). if you did this). In this way, the numerical values stored in the buffer memory area 22n and the display memory area 22p are sequentially overwritten and updated according to the latest input operation.

The tax rate storage area 22r stores numerical values indicating tax rates 0 to 4 set for the tax calculation keys 11b (tax n calculation keys 11b0 to 11b4), respectively. For example, five tax rates (0%, 5%, 12%, 18%, 28%) are set in the tax n calculation keys 11b0 to 11b4 at the time of shipment from the factory in accordance with use in India. In this case, the tax rate storage area 22e stores "0", "5", "12", "18" and "28" for tax rates 0 to 4 corresponding to the tax n calculation keys 11b0 to 11b4. A numeric value is stored.

Next, the operation of the calculator 10 according to this embodiment will be described. 3, 4, 5, 6 and 7 are flow charts for explaining the operation of the tax calculation function of the calculator 10 in this embodiment. 8, 9, 10 and 11 are diagrams showing specific examples of input operations and displays for explaining the tax calculation function of the calculator 10 in this embodiment.

In the following explanation, the tax rate 1 corresponding to the tax 1 calculation key ([GST+1(TAX-1)]) 11b1 is assumed to be 5% for convenience.

First, the user operates (presses) the [AC] key 11a in order to clear the display and memory contents before starting calculation. When the [AC] key 11a is operated (step A9: Yes), the CPU 21 displays the tax rate-by-tax total memory areas 22b to 22f, the tax total memory area 22g, the total memory area 22h, and the buffer memory area 22n of the memory 22. All memory areas 22p are cleared (step A12). The CPU 21 also turns off the total tax recall mode flag stored in the total tax recall mode area 22k (step A13). When the [AC] key 11a is operated while a numerical value such as the previous tax calculation result is displayed, the CPU 21 clears the previously displayed numerical value and displays "0". Further, when the [AC] key 11a is operated while the previous symbol is displayed in the status display area of the display unit 12, the CPU 21 clears the previously displayed symbol and hides it.

When an input operation to the tax calculation key 11b (any of the tax n calculation keys 11b0 to 11b4) is detected immediately after the input operation of the [AC] key 11a (step A19: Yes), A117: Yes), the CPU 21 The tax rate set for one of the tax n calculation keys 11b0 to 11b4 for which the input operation has been performed is read from the tax rate storage area 22r of the memory 22 and displayed on the display unit 12 (step A118). For example, when the tax 1 calculation key 11b1 is operated immediately after the input operation of the [AC] key 11a, the CPU 21 stores the numerical value indicating the tax rate 1 (5%) set for the tax 1 calculation key 11b1 in the tax rate storage area. 22r and causes the display unit 12 to display "5".

Here, if an input operation to the tax calculation key 11b (any of the tax n calculation keys 11b0 to 11b4) is subsequently detected without performing any key operation other than the tax calculation key 11b (step A19: Yes, A117: Yes), that is, as long as the key operation of the tax calculation key 11b continues, the CPU 21 sets one of the tax rates 0 to 4 set for the tax calculation key 11b for which the input operation is performed, in the same manner as described above. to read it from the memory 22 and display it on the display unit 12 (step A118).

That is, immediately after the input operation of the [AC] key 11a, by continuously operating any of the tax calculation keys 11b (tax n calculation keys 11b0 to 11b4), each tax calculation key 11b can be The set tax rates 0 to 4 can be continuously switched and displayed. After the last input operation of the [AC] key 11a, when only the input operation of the tax calculation key 11b is continuously performed two or more times, the input operation of the tax calculation key 11b after the second time is Strictly speaking, it is not performed immediately after the input operation of the [AC] key 11a, but in this specification, such an input operation is also performed immediately after the input operation of the [AC] key 11a. Consider. Further, if an input operation other than the tax calculation key 11b is performed even once after the last input operation of the [AC] key 11a, the subsequent input operation of the tax calculation key 11b is performed by pressing the [AC] key. It is assumed that it is not performed immediately after the input operation of 11a.

Next, when the user operates a numerical key to input a numerical value to be calculated (step A10: Yes), the CPU 21 inputs a numerical value (numerical code) corresponding to the numerical key operated for input. Then, the input numerical value is stored in the display memory area 22p and displayed on the display unit 12 (step A15).

Subsequently, when an operation key is operated (step A11: Yes), the CPU 21 inputs an operation (operation code) corresponding to the operated operation key, and converts an operation (symbol) symbol of the input operation. It is displayed in the state display area of the display unit 12 (step A16).

Further, the CPU 21 executes calculation based on the input operation code and the input numerical code, stores the numerical value of the result during the calculation in the display memory area 22p, and displays it on the display unit 12. FIG. Similarly, by repeating the input of the numerical code and the operational code, the CPU 21 sequentially stores the inputted numerical code and operational code. Then, when the operation execution key “=” (equal) 11h0 is operated by the user (step A17: Yes), the CPU 21 inputs the operation code corresponding to the operated operation execution key (“=” key) 11h0. Calculations are executed according to the numerical codes and operation codes that have been input so far, and the numerical values of the calculation results are stored in the display memory area 22p and displayed on the display section 12. FIG. In addition, the CPU 21 causes the total memory area 22h to store a numerical value as a result of normal calculation according to the numerical code and the operation code (step A18). When a numerical value is already stored in the total memory area 22h, the CPU 21 adds the numerical value obtained as a result of normal calculation to the previously stored numerical value and stores the result in the memory 22. FIG. If the operation execution key “=” (equal) 11h0 has not been operated by the user (step A17: No), the CPU 21 returns to the input operation waiting state.

Other than immediately after the input operation of the [AC] key 11a, when an input operation of the tax calculation key 11b is detected while a numerical value is displayed on the display unit 12 (step A19: Yes → A117: No), the CPU 21 The tax rate set to any one of the tax n calculation keys 11b0 to 11b4 for which the input operation was performed for the numerical value (set number) displayed on the display unit 12, that is, the numerical value stored in the display memory area 22p. to perform tax calculations. Numerical values to be used for tax calculation are not limited to numerical values displayed by normal calculation, and may be numerical values input simply by inputting numerical keys.

The tax calculation key 11b (each of the tax n calculation keys 11b0 to 11b4) serves both as a key for executing tax-inclusive calculation and a key for executing tax-excluded calculation. When the tax calculation key 11b is operated, the CPU 21 refers to the tax calculation mode area 22m to determine whether the current tax calculation mode is the tax-inclusive calculation mode or the tax-excluded calculation mode. Here, if the current tax calculation mode is the tax-inclusive calculation mode (step A110, tax included), the CPU 21 executes the tax-inclusive calculation and displays the tax calculation result in accordance with the key operation. (Step A111). If the current tax calculation mode is the tax-excluded calculation mode (step A110, tax-excluded), the CPU 21 executes the tax-excluded calculation and displays the tax calculation result according to the key operation. is executed (step A112).

The tax calculation mode is switched by operating the tax calculation mode switching key 11d. When the CPU 21 detects the operation of the tax calculation mode switching key 11d (step A14: Yes), the CPU 21 refers to the tax calculation mode area 22m to determine whether the current tax calculation mode is the tax-inclusive calculation mode or the tax-excluded calculation mode. determine if there is

If the current tax calculation mode is the tax-inclusive calculation mode (step A113, tax included), the CPU 21 stores tax calculation mode data indicating the tax-excluded calculation mode in the tax calculation mode area 22m (step A114). Further, the CPU 21 displays the tax calculation mode symbol 12b ([TAX-]) indicating the tax exclusion calculation mode in the state display area of the display section 12 (step A116).

On the other hand, if the current tax calculation mode is the tax-excluded calculation mode (step A113, tax excluded), the CPU 21 stores tax calculation mode data indicating the tax-inclusive calculation mode in the tax calculation mode area 22m (step A115). Further, the CPU 21 displays the tax calculation mode symbol 12b ([GST+]) indicating the tax calculation mode in the state display area of the display section 12 (step A116).

When the tax calculation mode is switched according to the operation of the tax calculation mode switching key 11d, the CPU 21 changes the calculation results (total amount excluding tax, total amount including tax, total amount ) remains unchanged. Therefore, when the tax-inclusive calculation and the tax-excluded calculation are executed together, even if the tax calculation mode is switched, the calculation result in the middle of the calculation is held.

Next, tax-included calculation processing in this embodiment will be described with reference to the flowchart shown in FIG.

When the tax 0 calculation key 11b0 is operated (step B1: Yes), the CPU 21 executes tax rate 0 calculation processing using the tax rate 0 set for the tax 0 calculation key 11b0 (step B6). Similarly, when the tax 1 calculation key 11b1 is operated (step B2: Yes), the CPU 21 executes tax rate 1 calculation processing (step B10), and when the tax 2 calculation key 11b2 is operated, (Step B3: Yes), tax rate 2 calculation processing is executed (step B3), and when the tax 3 calculation key 11b3 is operated (step B4: Yes), tax rate 3 calculation processing is executed (step B8), When the tax 4 calculation key 11b4 is operated (step B5: Yes), tax rate 4 calculation processing is executed (step B9).

The tax rate 0 calculation process, tax rate 1 calculation process, tax rate 2 calculation process, tax rate 3 calculation process, and tax rate 4 calculation process are basically the same. Here, tax rate 1 calculation processing will be described, and detailed description of other calculation processing will be omitted.

FIG. 6 is a flowchart for explaining the tax rate 1 calculation process of the tax-inclusive calculation process in this embodiment.
When the input operation of the tax 1 calculation key 11b1 is detected (step B2: Yes), the CPU 21 refers to the total tax recall mode area 22k to determine whether the total tax recall mode is off. The total tax recall mode is turned on by operating the total tax calculation key 11c. The transition to the ON state of the total tax recall mode is performed in step A28, which will be described later.

Here, if the total tax recall mode is off (step B21: Yes), the CPU 21 reads out the numerical value (number) stored in the display memory area 22p, and uses the read numerical value as the tax-excluded amount. Based on the tax-excluded amount and the tax rate 1 ("5%") that is the tax rate corresponding to the tax calculation key 11b for which the input operation was performed, the tax-inclusive amount and the tax amount are calculated, and the calculated tax-inclusive amount and tax amount and the tax-excluded amount indicated by the displayed numerical value are stored in the tax rate 1 total memory area 22c (step B22). Further, the CPU 21 causes the buffer memory area 22n to store the numerical value used for tax-inclusive calculation stored in the display memory area 22p, and stores the numerical value of the tax-inclusive amount calculated based on the tax rate 1 in the display memory area 22p. (Step B23). Further, the CPU 21 causes the display unit 12 to display the tax-inclusive amount calculated based on the tax rate 1 (step B24).

It should be noted that if step B22 has been executed one or more times before the current execution of step B22 after the last input operation of the [AC] key 11a, the previously executed one or more times The tax-excluded amount or total amount, the tax-inclusive amount or total amount, and the tax amount or total amount calculated in step B22 are already stored in the tax rate 1 total memory area 22c before step B22 is executed this time. There will be Therefore, when executing step B22, if the tax rate 1 total memory area 22c already stores the tax-exclusive amount or its total amount, the tax-inclusive amount or its total amount, or the tax amount or its total amount, the stored amount is Add the tax-excluded amount, tax-included amount, and tax amount calculated when step B22 is executed this time to each of the tax-excluded amount, the tax-included amount, or the tax amount, and the tax amount, or the total amount thereof, respectively. . In this way, in the tax rate 1 total memory area 22c, the total tax rate 1 total memory area 22c stores the data without tax obtained by one or more calculations including tax of tax rate 1 (step B22) executed after the last input operation of the [AC] key 11a. Each sum of the amount, tax-included amount, and tax amount is stored.

In this way, the CPU 21 can continuously instruct the tax-inclusive calculation for a plurality of numerical values (numbers) in accordance with the input operation on the tax 1 calculation key 11b1.

While the tax-inclusive amount is being displayed, by continuing to operate the tax 1 calculation key 11b1 that was operated to instruct tax calculation, the display of the tax-inclusive amount, the tax-excluded amount, and the tax amount can be switched. . For example, when the tax-inclusive amount calculated based on tax rate 1 is displayed (step B24), if the tax 1 calculation key 11b1 is operated (step B25: Yes), the CPU 21 stores the amount in the buffer memory area 22n. The numerical value (number entered) is read out and displayed as the tax-excluded amount (step B26). As described above, at this time, that is, immediately after the tax-inclusive calculation (immediately after execution of steps B22 and B23), the value of the tax-excluded amount used in the tax-inclusive calculation is stored in the buffer memory area 22n. When the tax-excluded amount is displayed (step B26), if the tax 1 calculation key 11b1 is operated (step B27: Yes), the CPU 21 displays the numerical value (tax-excluded amount) stored in the buffer memory area 22n. ), the tax amount is calculated again based on the read numerical value and the tax rate 1, and the numerical value is displayed on the display unit 12 (step B28). Further, when the tax 1 calculation key 11b1 is subsequently operated (step B29: Yes), the CPU 21 reads the numerical value (amount without tax) stored in the buffer memory area 22n, and calculates the read numerical value and the tax rate 1. The tax-inclusive amount is calculated again, and the numerical value is displayed on the display unit 12 (step B24).

In this manner, the calculator 10 calculates the tax-inclusive amount according to the operation of the tax 1 calculation key 11b1, and then sequentially displays the tax-inclusive amount, the tax-excluded amount, and the tax amount each time the tax 1 calculation key 11b1 is operated. , can be switched and displayed. Therefore, the tax-included amount, the tax-excluded amount, and the tax amount can be easily confirmed.

On the other hand, if the tax total recall mode is on (step B21: No), the CPU 21 stores the first tax-inclusive amount, which indicates the total of the tax-inclusive amount calculated by tax rate 1 for at least one numerical value, in the tax rate 1 total memory. It is read out from the area 22c and displayed on the display unit 12 (step B30). The transition to the ON state of the total tax recall mode will be described later.

Further, when the tax 1 calculation key 11b1 is operated while the first tax-included total amount is displayed (step B31, Yes), the CPU 21 retrieves the first tax-included total amount from the tax rate 1 total memory area 22c. The first total amount excluding tax (total amount excluding tax) is read out and displayed (step B32). Further, when the tax 1 calculation key 11b1 is operated while the first tax-excluded amount is displayed (step B33: Yes), the CPU 21 retrieves the first tax-included total amount from the tax rate 1 total memory area 22c. 1 The total amount of tax (total amount of tax) is read out and displayed (step B34). Further, when the tax 1 calculation key 11b1 is operated while the first tax total amount is displayed (step B35: Yes), the CPU 21 reads the first tax total amount from the tax rate 1 total memory area 22c and displays it. (step B30).

That is, when the tax total recall mode is on, the calculator 10 displays the first total tax-inclusive amount, the first total tax-excluded amount, and the first total tax-inclusive amount calculated based on the tax rate 1 each time the tax 1 calculation key 11b1 is operated. It is possible to sequentially switch to the display of the total amount. Therefore, after tax calculation with tax rate 1 for multiple values, as the calculation results of multiple tax calculations using tax rate 1, the first total amount including tax, the first total amount excluding tax, and the first total tax amount can be easily calculated. can be verified.

When the tax total recall mode is on (step B21: No), the CPU 21 detects that any one of the plurality of tax calculation keys 11b (11b0 to 11b4) has been operated (step B31: No). , step B33: No, step B35: No), the calculation processing corresponding to the operated tax calculation key 11b is performed (steps B36 to B39), and the same processing as steps B21 to B35 described above is executed.

For example, when it is detected that the tax 0 calculation key 11b0 has been operated in a state in which any one of the first total amount including tax, the first total amount excluding tax, and the first total amount including tax is displayed (step B31: No, Step B33: No, step B35: No→step B36: Yes), the CPU 21 shifts to tax rate 0 calculation processing (step B6). In this case, since the tax total recall mode is ON, the CPU 21 reads out the 0th tax-included total amount (total tax-included amount with tax rate 0) from the tax rate 0 total memory area 22b and displays it, as in step B30 described above. When the tax 0 calculation key 11b1 is operated while the 0th tax-included total amount is displayed, the CPU 21 reads the 0th tax-included total amount (tax rate 0) from the tax rate 1 total memory area 22c as in step B32 described above. (total amount excluding tax) is read out and displayed. Further, when the tax 0 calculation key 11b0 is operated while the 0th tax total amount is displayed, the CPU 21 reads the 0th tax total amount (tax rate 0) from the 0th tax total amount (tax rate 0 (total of the tax amount of tax) is read out and displayed.

Similarly, when it is detected that the tax 2 calculation key 11b2 has been operated (step B37: Yes), the CPU 21 shifts to tax rate 2 calculation processing (step B7) and executes the same processing as described above. When the CPU 21 detects that the tax 3 calculation key 11b3 has been operated (step B38: Yes), the CPU 21 shifts to tax rate 3 calculation processing (step B8), and detects that the tax 4 calculation key 11b4 has been operated. is detected (step B27: Yes), the process proceeds to tax rate 4 calculation processing (step B9), and the same processing as described above is executed. When it is detected that the tax calculation total key 11c has been operated (step B40: Yes), the CPU 21 performs processing for displaying the total amount including tax, the total amount excluding tax, and the total amount of tax calculated at each tax rate. (processing of steps A29 to A214 to be described later). If it is not detected that the tax calculation total key 11c has been operated (step B40: No), the CPU 21 returns to the input operation waiting state. In the tax rate 0 calculation process, the tax rate 2 calculation process, the tax rate 3 calculation process, and the tax rate 4 calculation process, when the operation of the tax 1 calculation key 11b1 is detected, the tax rate 1 calculation process is executed as shown in FIG. Move (step B10).

In each calculation process of tax rate 0 to tax rate 4, while the tax total recall mode is on, by operating the tax calculation key 11b corresponding to each other tax rate, the tax calculation key 11b corresponding to the operated tax rate is activated. By shifting to another calculation process, the total amount including tax, the total amount excluding tax, and the total amount including tax calculated based on the tax rate corresponding to the other calculation process can be displayed.

Therefore, when the tax total recall mode is in the ON state, by selecting one of the plurality of tax calculation keys 11b (11b0 to 11b4), the tax rate corresponding to the operated tax calculation key 11b can be calculated. , the total amount including tax, the total amount excluding tax, and the total amount including tax can be easily confirmed.

Next, tax-excluded calculation processing in this embodiment will be described with reference to the flowchart shown in FIG. Here, a case where the tax 1 calculation key 11b1 is operated will be described. When the tax 0 calculation key 11b0, tax 2 calculation key 11b2, tax 3 calculation key 11b3, and tax 4 calculation key 11b4 are operated, the same processing as when the tax 1 calculation key 11b1 is operated is executed. detailed description is omitted.

When the CPU 21 detects that the tax 1 calculation key 11b1 has been operated, the CPU 21 reads out the numerical value (number) stored in the display memory area 22p and uses the read numerical value as the tax-inclusive amount. Based on the tax rate 1 ("5%") corresponding to the tax calculation key 11b operated for input, the tax-excluded amount is calculated (step C13). In addition, the CPU 21 causes the buffer memory area 22n to store the numerical value used for the tax-exclusive calculation stored in the display memory area 22p, and stores the numerical value of the tax-excluded amount calculated based on the tax rate 1 in the display memory area 22p. Store (step C2). Furthermore, the CPU 21 causes the display unit 12 to display the tax-excluded amount calculated based on tax rate 1 (step C3).

By continuously operating the tax 1 calculation key 11b1, which has been operated to instruct tax calculation, while the tax-excluded amount is being displayed, the display of the tax-excluded amount and the tax amount can be switched. For example, when the tax-excluded amount calculated based on tax rate 1 is displayed (step C3), if the tax 1 calculation key 11b1 is operated (step C4: Yes), the CPU 21 stores The stored numerical value (amount including tax) is read, the tax amount is calculated again based on the read numerical value and the tax rate 1, and the calculated numerical value is displayed on the display unit 12 (step C5). Further, when the tax 1 calculation key 11b1 is subsequently operated (step C6: Yes), the CPU 21 reads out the numerical value (tax-excluded amount) stored in the buffer memory area 22n, and displays the read numerical value on the display section 12. display (step C3).

In this way, the calculator 10 calculates the tax-excluded amount according to the operation of the tax 1 calculation key 11b1, and then alternately switches between the display of the tax-excluded amount and the tax amount each time the tax 1 calculation key 11b1 is operated. can be displayed. Therefore, it is possible to easily confirm the tax-excluded amount and the tax amount.

In the tax-excluded calculation process, even if the tax 1 calculation key 11b1 is operated, the tax-included amount is not displayed. In addition, in the tax-inclusive calculation process, the calculation result calculated according to the operation of the tax calculation key 11b is reflected (added) to the tax rate 1 total memory area 22c. not reflected in

On the other hand, in step C3, the numerical value calculated by tax-excluded calculation (tax-excluded amount) can be used as a set number, and tax-inclusive calculation using another tax rate or normal calculation can be continuously executed.

For example, in a market such as India that uses multiple consumption tax rates, it is expressed as MRP (abbreviation for Maximum Retail Price, retail price = amount including tax). Therefore, when calculating the tax-inclusive amount using a different tax rate based on the tax-inclusive amount, after returning the tax-inclusive amount to the tax-excluded amount, execute the tax-inclusive calculation again according to the different tax rate, It is necessary to find the amount, the amount including tax, and the amount of tax.

In the calculator 10 according to the present embodiment, when a tax-excluded calculation is required as described above while performing tax-inclusive calculations (total amount without tax, total amount including tax, total amount with tax) for a plurality of numerical values, , even if the tax calculation mode is switched from the tax-inclusive calculation mode to the tax-excluded calculation mode, the data in the tax rate total memory areas 22b to 22f corresponding to each tax rate 0 to 4 (calculation results up to the middle of the calculation) are discarded (cleared). ) is not done. Therefore, the calculator 10 can perform tax calculation by switching the tax calculation mode as necessary even when the tax-inclusive calculation and the tax-excluded calculation are executed together, so that the tax calculation can be performed efficiently.

Next, the processing according to the input operation on the tax calculation total key ([GST GT (GT)]) 11c in this embodiment will be described with reference to the flowchart shown in FIG.
The tax calculation total key 11c includes a grand total key ([GT] key) for displaying the total sum of normal calculation (basic calculation) and a GST grand total key ([GT] key) for displaying the total sum of tax calculation results. [GST GT] key).

When the CPU 21 detects that the tax calculation total key 11c has been operated (step A21: Yes), the CPU 21 determines whether the tax total recall mode flag is on (step A22). When the CPU 21 determines that the total tax recall mode flag is ON (step A22: Yes), the process proceeds to step A29. In other words, the CPU 21 sets the tax total recall mode flag regardless of whether the display unit 12 is displaying a numerical value indicating the result of the executed tax calculation or normal calculation, that is, regardless of the display contents of the display unit 12. is on (step A22: Yes), the process proceeds to step A29. If it is determined that the tax total recall mode flag is ON (step A22: No), the operation of the tax calculation total key 11c is a normal depression (less than a predetermined time, the operation continues to be depressed), or It is determined whether it is a long press operation (an operation in which the pressed state is continued for a predetermined time or longer).

Here, if it is determined that it is a normal pressing operation (step A23: No), the CPU 21 determines whether the operation immediately before pressing the tax calculation total key 11c is tax calculation. That is, the CPU 21 determines whether the tax calculation total key 11c has been operated immediately after tax calculation in response to the operation of the tax calculation key 11b, or in other words, whether the tax calculation total key 11c has been operated following the operation of the tax calculation key 11b. determine.

Here, if it is determined that the tax calculation total key 11c has been operated immediately after tax calculation (step A26: Yes), the CPU 21 turns on the tax total recall mode stored in the tax total recall mode area 22k (step A28). ). That is, the tax calculation total key 11c operated immediately after tax calculation is used as a GST grand total key ([GST GT] key) for displaying the total of the tax calculation results.

In this case, the CPU 21 sums the tax-inclusive amount, the tax-excluded total amount, and the tax total amount calculated based on the tax rates 0 to 4 stored in the tax rate-by-tax total memory areas 22b to 22f. The tax-included total amount, the tax-excluded total amount, and the total tax amount are calculated and stored in the tax total memory area 22g. Further, the CPU 21 stores the calculated total tax-inclusive amount in the display memory area 22p and displays it on the display unit 12 (step A29).

When the total amount including tax is displayed (step A29), if the tax calculation total key 11c is operated (step A210: Yes), the CPU 21 reads the total amount excluding tax from the total tax memory area 22g, It is stored in the display memory area 22p and displayed on the display section 12 in place of the total amount including tax (step A211).

Further, when the tax total amount is displayed (step A211) and the tax calculation total key 11c is operated (step A212, Yes), the CPU 21 reads out the tax total amount from the tax total memory area 22g. are stored in the display memory area 22p and displayed on the display unit 12 in place of the tax-excluded total amount (step A213).

Further, when the total tax amount is displayed (step A213), if the tax calculation total key 11c is operated (step A214: Yes), the CPU 21 reads out the total tax amount from the total tax memory area 22g. , is stored in the display memory area 22p and displayed on the display unit 12 in place of the total tax amount (step A29).

That is, the calculator 10 according to the present embodiment calculates the total tax-included total amount in response to the operation of the tax calculation total key 11c, and corresponds to the total tax-included total amount and the total tax-included total amount for each operation of the tax calculation total key 11c. The display can be sequentially switched to the total tax amount corresponding to the tax-excluded total amount and the tax-included total amount. Therefore, the total tax-inclusive amount, the tax-excluded total amount, and the tax total amount can be easily confirmed.

On the other hand, when the CPU 21 determines that the operation immediately before the tax calculation total key 11c is pressed is not tax calculation, that is, the tax calculation total key 11c is operated immediately after normal calculation (step A26: No), the total memory area A numerical value as a result of the normal calculation stored in 22h is read out, stored in the display memory area 22p, and displayed on the display unit 12 (step A27). That is, the tax calculation total key 11c operated immediately after the normal calculation is used as a grand total key ([GT] key) for displaying the total calculated by the normal calculation.

Thus, in the calculator 10 of this embodiment, one tax calculation total key 11c is provided on the front of the housing with a limited area, and the grand total key ([GT] key) and the GST grand total key ([GST GT] key) are provided. ). Since the function of the tax calculation total key 11c is switched according to the immediately preceding state (immediately after tax calculation, immediately after normal The grand total of normal calculations can be easily displayed.

If the CPU 21 detects an operation of the tax calculation total key 11c (step A21: Yes) and determines that the operation of the tax calculation total key 11c is a long press operation (step A23: Yes), the tax Processing is executed so as to display a calculation result opposite to that when the calculation total key 11c is pressed.

That is, when the tax calculation total key 11c is long-pressed (step A23: Yes), the CPU 21 determines that the operation of the tax calculation total key 11c is performed immediately after the tax calculation ( Step A24: Yes), the numerical value as the result of the normal calculation stored in the total memory area 22h is read out, stored in the display memory area 22p, and displayed on the display unit 12 (step A27).

Further, when the tax calculation total key 11c is long-pressed (step A23: Yes), the CPU 21 determines that the operation of the tax calculation total key 11c is not performed immediately after the tax calculation (step A23: Yes). A24: No), in the same manner as described above, the total tax recall mode stored in the total tax recall mode area 22k is turned on (step A28). In addition, the CPU 21 totals the tax-inclusive amount, tax-excluded total amount, and tax total amount calculated based on the respective tax rates 0 to 4 stored in the tax rate-by-tax total memory areas 22b to 22f. The tax-included total amount, tax-excluded total amount, and tax total amount are calculated and stored in the total tax memory area 22g. Further, the CPU 21 causes the display memory area 22p to store the calculated total tax-included total amount and displays it on the display unit 12 (step A29).

In this way, by pressing the tax calculation total key 11c for a long time, it is possible to execute a process opposite to the normal operation of pressing the tax calculation total key 11c. As a result, regardless of whether or not the tax calculation was performed immediately before the tax calculation total key 11c was operated, the total sum of the tax calculation (the total amount including tax, the total amount excluding tax, and the total amount of tax) and the total amount of the normal calculation are displayed. The total can be easily switched and displayed simply by changing the operation time (pressing time) for the tax calculation total key 11c.

Next, an example of specific numerical value input and tax calculation in this embodiment will be described. Here, for ease of explanation, two tax calculation keys using tax 1 calculation key 11b1 [GST+1] (tax rate 1 (5%)) and tax 2 calculation key 11b2 [GST+2] (tax rate 2 (10%)) are used. A calculation example will be described. Tax calculation using the tax 0 calculation key 11b0, the tax 3 calculation key 11b3, and the tax 4 calculation key 11b4 is executed in the same manner as when the tax 1 calculation key 11b1 and the tax 2 calculation key 11b2 are operated. detailed description is omitted.

8A and 8B show specific key operations used in the following description, numerical values displayed on the display unit 12, and values stored in the tax rate 1 total memory area 22c and the tax rate 2 total memory area 22d, respectively. The total amount including tax, the total amount excluding tax, the total amount including tax, and the total amount of normal calculation stored in the total memory area 22h are shown. The key operations shown in FIGS. 8A and 8B show an example in which tax calculation and normal calculation are mixed and executed. FIG. 8A shows a key operation when the operation immediately before the tax calculation total key 11c is operated is tax calculation, and FIG. It shows the key operation when it is not a calculation. FIG. 9 shows an example of key operations and display on the display unit 12 shown in FIG. 8(A).

When the [AC] key 11a is operated, the CPU 21 clears the tax rate-by-tax total memory areas 22b to 22f (FIG. 9(A)). Further, the CPU 21 refers to the tax calculation mode area 22m, and if it determines that the current tax calculation mode is the tax-inclusive calculation mode, it selects [GST+], and if it determines that it is the tax-excluded calculation mode, it selects [TAX-]. , is displayed in the state display area of the display section 12 as the tax calculation mode symbol 12b. As described above, the tax calculation mode does not change even if the [AC] key 11a is operated. This is a display example.

After that, when the numerical value "200" is input for tax calculation, the CPU 21 stores the input numerical value in the display memory area 22p and causes the display unit 12 to display it. Next, when the tax 1 calculation key 11b1 is operated, the CPU 21 causes the display section 12 to display the tax-inclusive amount "210" calculated based on the tax rate 1 and "GST+1" as the tax calculation key symbol 12c (Fig. 9 (B1)). Further, the CPU 21 causes the tax rate 1 total memory area 22c to store the result of the tax calculation using the tax rate 1 by the tax 1 calculation key 11b1. In this case, as shown in FIG. 7A, the tax rate 1 total amount including tax "210", the tax rate 1 total amount excluding tax "200", and the tax total amount "10" for tax rate 1 are stored in the tax rate 1 total memory area 22c. stored in At the same time, the tax-excluded amount "200" is stored in the buffer memory area 22n (not shown).

Next, when the "100", [x], "7", and [=] keys are operated for normal calculation, the CPU 21 executes normal calculation of "100×7=700", The numerical value of the calculation result "700" is stored in the display memory area 22p and displayed on the display section 12 (Fig. 9 (B2)). Also, the CPU 21 stores the calculation result of the normal calculation in the total memory area 22h. Further, the CPU 21 displays "GT" in the state display area of the display section 12 as the total display symbol 12e.

Next, when the numerical value "300" is input for tax calculation, the CPU 21 stores the input numerical value in the display memory area 22p and causes the display unit 12 to display it. Next, when the tax 1 calculation key 11b1 is operated, the CPU 21 causes the display memory area 22p to store the tax-inclusive amount "315" calculated based on the numerical value "300" being displayed on the display unit 12 and the tax rate 1. together with it, is displayed on the display unit 12 . At the same time, the CPU 21 causes the display unit 12 to display the tax calculation key symbol "GST+1" ((B3) in FIG. 9). Further, the CPU 21 causes the tax rate 1 total memory area 22c to store the result of the tax calculation using the tax rate 1 by the tax 1 calculation key 11b1. In this case, as shown in FIG. 7(A), the tax calculation results for the number "300" are the tax included amount of tax rate 1 "315", the tax excluded amount of tax rate 1 "300", and the tax amount of tax rate 1 "15". In addition, it is added to the previously stored tax rate 1 total tax amount "210", tax rate 1 tax total amount "200", and tax rate 1 total tax amount "10". As a result, the tax rate 1 total tax amount "525", the tax rate 1 tax total amount "500", and the tax rate 1 total tax amount "25" are stored in the tax rate 1 total memory area 22c. At the same time, the tax-excluded amount "300" is stored in the buffer memory area 22n (not shown).

Similarly, when the numerical value "1000" is input and the tax 2 calculation key 11b2 is operated, and then the numerical value "2000" is input and the tax 2 calculation key 11b2 is operated, the CPU 21 turns on the tax 2 calculation key 11b2. , the values entered immediately before are used as tax-excluded amounts, and the tax-inclusive amounts ("1100" and "2200") calculated based on each tax-excluded amount and tax rate 2 are displayed in the memory area 22p. , and sequentially displayed on the display unit 12 . At the same time, the CPU 21 causes the display unit 12 to display the tax calculation key symbol "GST+2" (FIGS. 9(B4) and (B5)). Further, the CPU 21 stores the result of the tax calculation using the tax rate 2 by the tax 2 calculation key 11b2 in the tax rate 2 total memory area 22d as shown in FIG. 7(A). At the same time, the tax-excluded amount "1000" is first stored in the buffer memory area 22n, and then the tax-excluded amount "2000" is stored in the buffer memory area 22n (not shown).

Thus, the calculator 10 of this embodiment can arbitrarily specify the tax rate to be used for tax calculation for the input numerical value by operating the tax 1 calculation key 11b1 or the tax 2 calculation key 11b2. Therefore, for example, when calculating the total tax-inclusive amount of multiple products with different applicable tax rates, even if multiple products with different applicable tax rates are mixed, you can specify the tax rate for each and enter the tax-inclusive amount. . The results of tax calculation (amount including tax, amount excluding tax, amount of tax) for tax 1 calculation key 11b1 or tax 2 calculation key 11b2 are individually stored in tax rate 1 total memory area 22c and tax rate 2 total memory area 22d. can be kept Therefore, as will be described later, in the tax total recall mode, the tax calculation result can be displayed for each tax rate according to the operation of the tax 1 calculation key 11b1 or the tax 2 calculation key 11b2.

FIGS. 9C1 to 9C3 and 9F1 show display examples when the tax calculation total key [GST GT (GT)] 11c is operated (see FIG. 4).

When the tax calculation total key 11c is pressed normally after tax calculation is performed for a plurality of numerical values shown in FIGS. turn on the mode. In addition, the CPU 21 calculates tax rate 1 and A tax-included total amount "3825" indicating the total tax-included total amount (525+3300) to which tax rate 2 is applied is calculated, stored in the tax total memory area 22g, and displayed on the display unit 12 (Fig. 7(A) bottom). 3rd line from FIG. 9 (C1)). Furthermore, the CPU 21 displays "RCL" as the total tax recall mode symbol 12d in the state display area of the display section 12 (Fig. 9 (C1)). Here, when the tax calculation total key 11c is operated, the CPU 21 displays the total tax-excluded total amount " 3500” is displayed. Further, when the tax calculation total key 11c is operated, the CPU 21 displays the total tax amount "325" indicating the total tax amount to which tax rate 1 and tax rate 2 are applied, as shown in FIG. 9 (C3). display. Further, when the tax calculation total key 11c is operated, the CPU 21 returns to the display shown in FIG. .

On the other hand, when the tax calculation total key 11c is long-pressed after tax calculation is performed for a plurality of numerical values shown in FIGS. The total amount "700" is read out and displayed (first row from the bottom in FIG. 8(A), FIG. 9(F1)).

Next, the case of key operation shown in FIG. 8B will be described. It should be noted that the tax calculation shown in FIG. 8B is executed in the same manner as in FIG. In FIG. 8(B), after tax calculation (200 [GST+1] 300 [GST+1] 1000 [GST+1] 2000 [GST+1]) for multiple numerical values, normal calculation (100 [x] 7 [=]) is executed, Immediately after that, the tax calculation total key 11c is operated.

In this case, the CPU 21 displays the total amount "700" of the normal calculation stored in the total memory area 22h according to the operation of the tax calculation total key 11c (FIG. 8B, third row from the bottom, FIG. 9 (F1)).

On the other hand, when the tax calculation total key 11c is long-pressed after the tax calculation is performed for the plurality of numerical values shown in the 1st to 6th rows of FIG. 8B, the CPU 21 turns on the tax total recall mode. Further, the CPU 21 calculates tax rate 1 and tax rate 2 based on the tax-inclusive amount, tax-excluded total amount, and tax total amount of tax rate 1 and tax rate 2 stored in the tax rate 1 total memory area 22c and the tax rate 2 total memory area 22d, respectively. is calculated and stored in the total tax memory area 22g and displayed on the display unit 12 (1 from the bottom in FIG. 8B). line, FIG. 9 (C1)). Furthermore, the CPU 21 displays "RCL" as the total tax recall mode symbol 12d in the state display area of the display section 12 (Fig. 9 (C1)).

Thus, by operating (short press) the tax calculation total key 11c immediately after the normal calculation or by long-pressing the tax calculation total key 11c immediately after the tax calculation, the total by normal calculation can be displayed. . Further, as described above, by operating (short pressing) the tax calculation total key 11c immediately after tax calculation, or by long-pressing the tax calculation total key 11c immediately after normal calculation, the total total by tax calculation is displayed. Therefore, one tax calculation total key 11c can be selectively used according to the immediately preceding operation state.

Next, the case where the tax 1 calculation key 11b1 or the tax 2 calculation key 11b2 is operated after the total tax recall mode is turned on will be described.

9D1 to 9D3 show display examples when the tax 1 calculation key 11b1 is operated. When the tax 1 calculation key 11b1 is operated in the state shown in FIGS. 9(C1) to (C3), the CPU 21 calculates tax rate 1 based on tax rate 1 as shown in FIG. 9(D1). The first tax-included total amount "525" is displayed. Here, when the tax 1 calculation key 11b1 is operated, the CPU 21 displays the first tax-excluded total amount "500" as shown in FIG. 9 (D2). Further, when the tax 1 calculation key 11b1 is operated, the CPU 21 displays the first total tax amount "25" as shown in FIG. 9 (D3). Further, when the tax 1 calculation key 11b1 is operated, the CPU 21 returns to the display shown in FIG. 9(D1) and displays the first tax-included total amount "525".

When the tax 2 calculation key 11b2 is operated in the display state shown in FIGS. 9(D1) to (D3), the CPU 21 displays the second tax-included total amount shown in FIG. 9(E1) described below. switch to When the tax calculation total key 11c is operated in the display state shown in FIGS. 9(D1) to (D3), the CPU 21 switches to the display state of the tax-included total amount shown in FIG. 9(C1). Transition.

FIGS. 9E1 to 9E3 show display examples when the tax 2 calculation key 11b2 is operated. When the tax 2 calculation key 11b2 is operated in the state shown in FIGS. 9(C1) to 9(C3), the CPU 21 calculates tax rate 2 based on the tax rate 2 as shown in FIG. 9(E1). The second tax-included total amount "3300" is displayed. Here, when the tax 2 calculation key 11b2 is operated, the CPU 21 displays the second tax-excluded total amount "3000" as shown in FIG. 9 (E2). Further, when the tax 2 calculation key 11b2 is operated, the CPU 21 displays the second total tax amount "300" as shown in FIG. 8 (E3). Further, when the tax 2 calculation key 11b2 is operated, the CPU 21 returns to the display shown in FIG. 9(E1) and displays the second total amount including tax "3300".

When the tax 1 calculation key 11b1 is operated in the display states shown in FIGS. 9(E1) to (E3), the CPU 21 switches to the display of the first tax-included total amount shown in FIG. 9(D1). Further, when the tax calculation total key 11c is operated in the display state shown in FIGS. Transition.

Thus, while the tax total recall mode is on, the calculator 10 according to the present embodiment can calculate tax-inclusive values for tax rates 1 and 2 by simply operating the tax 1 calculation key 11b1 and the tax 2 calculation key 11b2. The display can be switched between the total amount, the total amount excluding tax, and the total amount including tax. Therefore, the total amount including tax, the total amount excluding tax, and the total amount of tax for each tax rate can be easily confirmed.

Further, while the tax total recall mode is on, the calculator 10 according to the present embodiment displays the total total (Fig. 9 (C1 ) to (C3)), total display of tax rate 1 corresponding to tax 1 calculation key 11b1 ((D1) to (D3) in FIG. 9), and total display of tax rate 2 corresponding to tax 2 calculation key 11b2 (FIG. 9 (E1) to (E3)) can be switched and displayed.

Next, a case where tax-inclusive calculation and tax-excluded calculation are executed together will be described. FIG. 10 shows specific key operations used in the following description, numerical values displayed on the display unit 12, the total tax-included amount stored in the tax rate 1 total memory area 22c and the tax rate 2 total memory area 22d, and the tax-excluded amount. It shows the total amount and total tax amount.

The key operations shown in FIGS. 8(A) and 8(B) described above describe the case where only tax-inclusive calculation is executed, but the key operations shown in FIG. It shows an example of switching to and executing.

When the [AC] key 11a is operated, the CPU 21 clears the tax total memory areas 22b to 22f by tax rate. Here, the calculation mode is the tax calculation mode, and the display unit 12 displays [GST+] indicating the tax calculation mode as the tax calculation mode symbol 12b.

After that, for tax calculation (calculation including tax), the numerical value "200" is input as the tax-excluded amount, and when the tax 1 calculation key 11b1 ([GST+1 (TAX-1)]) is operated, the CPU 21 The value obtained is stored in the buffer memory area 22n, and the tax-included amount "210" calculated by tax-included calculation based on the tax-excluded amount and tax rate 1 and the tax-included amount calculated based on tax rate 1 are displayed. to display the symbol "GST+1". Further, the CPU 21 causes the tax rate 1 total memory area 22c to store the result of the tax calculation using the tax rate 1 by the tax 1 calculation key 11b1. In this case, as shown in FIG. 9, the tax rate 1 total tax amount "210", the tax rate 1 tax total amount "200", and the tax rate 1 total tax amount "10" are stored in the tax rate 1 total memory area 22c. be.

Similarly, when the number "300" is entered as the tax-excluded amount for tax calculation and the tax 2 calculation key 11b2 is operated, the CPU 21 stores the entered number in the buffer memory area 22n. The tax-inclusive amount "330" calculated by tax-inclusive calculation based on the tax-excluded amount and tax rate 2 and the symbol "GST+2" representing that the tax-inclusive amount calculated based on tax rate 2 is displayed. Further, the CPU 21 causes the tax rate 2 total memory area 22d to store the result of the tax calculation using the tax rate 2 by the tax 2 calculation key 11b2. In this case, as shown in FIG. 10, the tax rate 2 total tax amount "330", the tax rate 2 tax total amount "300", and the tax rate 2 total tax amount "30" are stored in the tax rate 2 total memory area 22d. be.

Next, when the tax 2 calculation key 11b2 is operated in the state where the total amount including tax of tax rate 2 "330" is displayed, the CPU 21 displays the value "300" as the amount excluding tax stored in the buffer memory area 22n. ” is read out and displayed on the display unit 12 .

Here, it is assumed that the tax calculation mode switching key 11d ([GST+/TAX-]) has been operated to switch the calculation mode to the tax-excluded calculation mode. When detecting the operation of the tax calculation mode switching key 11d, the CPU 21 switches the calculation mode to the tax exclusion calculation mode. Further, the CPU 21 causes the display unit 12 to display [TAX-] indicating the tax calculation mode as the tax calculation mode symbol 12b.

After that, when the number "660" is input as the tax-inclusive amount for tax calculation (calculation without tax) and the tax 2 calculation key 11b2 ([GST+2 (TAX-2)]) is operated, the CPU 21 The value obtained is stored in the buffer memory area 22n, and the tax-excluded amount "600" calculated by tax-excluded calculation based on the tax-included amount and tax rate 2 and the tax-excluded amount calculated based on tax rate 2 are displayed. A symbol "TAX-2" is displayed to indicate that the In the tax-excluded calculation, as shown in FIG. 10, the result of the tax-excluded calculation is not reflected in the tax rate 2 total memory area 22d.

Here, it is assumed that the tax calculation mode switching key 11d ([GST+/TAX-]) has been operated to switch the calculation mode to the tax-inclusive calculation mode. When detecting the operation of the tax calculation mode switching key 11d, the CPU 21 switches the calculation mode to the tax calculation mode.

After that, when the tax 1 calculation key 11b1 ([GST+1)]) is operated in a state where the numerical value "600" is displayed due to tax calculation (calculation including tax), the CPU 21 The tax-inclusive amount "630" calculated by tax-inclusive calculation based on the numerical value and the tax rate 1, and the symbol "GST+1" indicating that the tax-inclusive amount calculated based on the tax rate 1 is displayed. Further, the CPU 21 adds the result of tax calculation using the tax rate 1 using the tax 1 calculation key 11b1 (tax excluded amount, tax included amount, tax amount) to the numerical value previously stored in the tax rate 1 total memory area 22c. As a result, the tax rate 1 total tax amount "840", the tax rate 1 tax total amount "800", and the tax rate 1 total tax amount "30" are stored in the tax rate 1 total memory area 22c.

In this way, when performing tax-inclusive calculations with tax rate 1 for the number "660" that indicates the tax-inclusive amount of tax rate 2, the tax-excluded amount of "660" is calculated by switching to the tax-excluded calculation mode in the middle of the tax-inclusive calculation. A tax-excluded calculation can be performed to The numerical value (number) displayed on the display unit 12 as the calculation result of tax-excluded calculation can be used as it is for the tax calculation. Also, the tax-excluded calculation does not affect the numerical values stored in the tax rate 1 total memory area 22c and the tax rate 2 total memory area 22d. Therefore, by switching the tax calculation mode to the tax-inclusive calculation mode again, selecting a different tax rate 1 for the numerical value being displayed, and executing the tax-inclusive calculation, the result of the tax-inclusive calculation using the tax rate 1 is stored in the tax rate 1 total memory. It can be reflected in the area 22c.

Therefore, in a market like India that uses multiple consumption tax rates, if you need to calculate the tax based on the tax-inclusive price of the product with another tax rate, you can switch to the tax-excluded calculation mode. It is possible to execute tax-excluded calculation to obtain the price without tax, and then execute tax-inclusive calculation again with another tax rate.

Next, a case where both tax calculation and normal calculation are executed will be described. FIG. 11 shows specific key operations used in the following description, numerical values displayed on the display unit 12, the total tax-included amount stored in the tax rate 1 total memory area 22c and the tax rate 2 total memory area 22d, and the tax-excluded amount. It shows the total amount and total tax amount. Here, an example of executing the four arithmetic operations using numerical values (numbers) obtained by tax calculation will be described. The downward arrows in the 3rd to 8th columns in FIG. does not change).

When the [AC] key 11a is operated, the CPU 21 clears the tax total memory areas 22b to 22f by tax rate. Here, the calculation mode is the tax calculation mode, and the display unit 12 displays [GST+] indicating the tax calculation mode as the tax calculation mode symbol 12b.

Next, when the numerical value "200" is input as the amount excluding tax and the tax 1 calculation key 11b1 is operated, the CPU 21 stores the input numerical value in the buffer memory area 22n, and calculates the amount excluding tax and tax rate 1. The tax-included amount "210" calculated based on the tax-included calculation and the symbol "GST+1" indicating that the tax-included amount calculated based on the tax rate of 1 are displayed. Further, the CPU 21 causes the tax rate 1 total memory area 22c to store the result of the tax calculation using the tax rate 1 by the tax 1 calculation key 11b1. In this case, as shown in FIG. 11, the tax rate 1 total tax amount "210", the tax rate 1 tax total amount "200", and the tax rate 1 total tax amount "10" are stored in the tax rate 1 total memory area 22c. be.

Similarly, when the number "200" is entered as the amount excluding tax and the tax 1 calculation key 11b1 is operated, the CPU 21 stores the entered number in the buffer memory area 22n and calculates the amount excluding tax and tax rate 1. The tax-inclusive amount "315" calculated by tax-inclusive calculation based on is displayed. The CPU 21 also adds the result of the tax calculation using tax rate 1 to the numerical value stored in the tax rate 1 total memory area 22c. As a result, as shown in FIG. 11, the tax rate 1 total tax amount "525", the tax rate 1 tax total amount "500", and the tax rate 1 total tax amount "25" are stored in the tax rate 1 total memory area 22c. be.

Subsequently, when the numerical value "1000" is input as the tax-exclusive amount and the tax 2 calculation key 11b2 is operated, the CPU 21 stores the input numerical value in the buffer memory area 22n and calculates the tax-exclusive amount and the tax rate 2. The tax-included amount "1100" calculated based on the tax-included calculation and the symbol "GST+2" indicating that the tax-included amount calculated based on the tax rate of 2 are displayed. Further, the CPU 21 causes the tax rate 2 total memory area 22d to store the result of the tax calculation using the tax rate 2 by the tax 2 calculation key 11b2. In this case, as shown in FIG. 11, the tax rate 2 total tax amount "1100", the tax rate 2 tax total amount "1000", and the tax rate 2 total tax amount "100" are stored in the tax rate 2 total memory area 22d. be.

Similarly, when the value "2000" is input as the amount excluding tax and the tax 2 calculation key 11b2 is operated, the CPU 21 stores the input value in the buffer memory area 22n and calculates the amount excluding tax and tax rate 2. The tax-inclusive amount "2200" calculated by the tax-inclusive calculation based on is displayed. Further, the CPU 21 adds the result of the tax calculation using tax rate 2 to the numerical value stored in the tax rate 2 total memory area 22d. As a result, as shown in FIG. 11, the tax rate 2 total tax amount "3300", the tax rate 2 tax total amount "3000", and the tax rate 2 total tax amount "300" are stored in the tax rate 2 total memory area 22d. be.

Here, it is assumed that the tax calculation total key 11c has been pressed as usual in order to display the total tax calculation total. The CPU 21 detects that the tax calculation total key 11c has been operated, and determines whether the tax total recall mode is on. When the CPU 21 detects that the tax total recall mode is not on and that the operation is performed immediately after tax calculation, the CPU 21 turns on the tax total recall mode and displays "RCL" indicating that the tax total recall mode is on. ” is displayed on the display unit 12 . "RCL" on the left side of the table in FIG. 11 indicates that the recall mode is in effect while the corresponding line is being displayed. A downward arrow indicates that the recall mode continues from the sixth line to the bottom to the second line, that is, until just before the [AC] key is pressed.

When the tax total recall mode is turned on, the CPU 21 causes the tax total memory area 22g to store the total tax amount "3825", which is the sum of the tax total amount calculated based on the tax rate 1 and the tax rate 2. , is displayed on the display unit 12 . Here, when the tax calculation total key 11c is repeatedly operated, the CPU 21 sequentially calculates the total tax-exclusive total amount "3500" and the total tax total amount "325" according to the key operation, and stores the total tax amount in the total tax memory. It is stored in the area 22g and is read out from the display section 12 and displayed.

When [÷] [2] [=] is keyed in for the calculation of the four arithmetic operations while the total tax amount "325" is being displayed, the CPU 21 changes the number "325" displayed on the display unit 12 to "325". On the other hand, the four arithmetic calculations of "325÷2=162.5" are executed, and the display unit 12 is caused to display the numerical value "162.5" as the calculation result. The numerical value "162.5" is stored in the total memory area 22h. In addition to displaying the total tax amount and executing the four arithmetic calculations, it is also possible to display the total tax-included total amount or the total tax-excluded total amount and execute the four arithmetic calculations.

In this way, even if the operation key or numeric key is operated for the four arithmetic operations during the tax calculation, the total tax recall mode is kept on. Further, the numerical values stored in the tax rate 1 total memory area 22c, the tax rate 2 total memory area 22d, and the tax total memory area 22g, which are stored by the tax calculation, are also maintained.

Here, it is assumed that the tax calculation total key 11c has been pressed as usual in order to display the total tax calculation total. When the CPU 21 detects that the tax calculation total key 11c has been operated, it determines whether the tax total recall mode is on. At this time, the tax total recall mode is already on. Accordingly, the CPU 21 causes the display section 12 to display the total tax-included total amount stored in the tax total memory area 22g in accordance with the operation of the tax calculation total key 11c. That is, when the tax calculation total key 11c is operated to input an instruction to read the total tax-included total amount in a state in which the tax total recall mode is set to the on state, the CPU 21 outputs the numerical value "162 5” is being displayed, the numerical value “3825” of the total amount including tax stored in the display memory area 22p is read out and displayed on the display unit 12 .

Next, it is assumed that the tax 1 calculation key 11b1 is operated to display the total amount including tax calculated using tax rate 1. FIG. When the tax 1 calculation key 11b1 is operated, the CPU 21 displays the first tax rate 1 total memory area 22c instead of displaying the tax total amount "3825" because the tax total recall mode is on. The numerical value “525” of the total amount including tax is read out and displayed on the display unit 12 .

Here, when the tax calculation total key 11c is operated again, the CPU 21, in the same manner as described above, responds to the operation of the tax calculation total key 11c to display the total tax-included total amount stored in the tax total memory area 22g. 3825” is displayed on the display unit 12. That is, when the total tax recall mode is set to ON, not only are the numerical values that are the calculation results of the normal calculation by the four arithmetic calculations displayed, but also the numerical values that are the calculation results of the tax calculation are being displayed on the display unit 12. , the total amount including tax can be displayed according to the operation of the tax calculation total key 11c. That is, after the tax total recall mode is set to ON state, the total tax-inclusive total amount can be displayed regardless of the display content when the tax calculation total key 11c is operated. It is assumed that the tax 2 calculation key 11b2 has been operated to display the total amount including tax calculated using the tax rate 2. When the tax 2 calculation key 11b2 is operated, the CPU 21 responds to the operation of the tax 2 calculation key 11b2 to display the second tax rate 2 total amount stored in the tax rate 2 total memory area 22d instead of displaying the total amount including tax "3825". The total amount including tax “3300” is read out and displayed on the display unit 12 .

That is, as shown in FIG. 11, the numerical value related to the tax calculation result based on the tax rate 1 is stored in the tax rate 1 total memory area 22c, and the numerical value related to the tax calculation result based on the tax rate 2 is stored in the tax rate 2 total memory area 22d. If stored, the numerical value (total amount including tax) stored in the tax rate 1 total memory area 22c is read in response to the operation of the tax 1 calculation key 11b1 while the tax total recall mode is set to ON. Similarly, the numerical value (total amount including tax) stored in the tax rate 2 total memory area 22d can be read out and displayed in response to the operation of the tax 2 calculation key 11b2.

Although not shown, numerical values related to tax calculation results based on tax rates 0, 3, and 4 are stored in the tax rate 0 total memory area 22b, tax rate 3 total memory area 22e, and tax rate 4 total memory area 22f, respectively. 11b0, tax 3 calculation key 11b3 or tax 4 calculation key 11b4.

In the above description, when the tax total recall mode is on, at least the tax-inclusive total is displayed in response to the operation of the tax n calculation keys 11b0 to 11b4. Either one may be displayed.

Next, when the tax 2 calculation key 11b2 is repeatedly operated in a state where the second total amount including tax "3300" is displayed, the CPU 21 displays the total amount excluding tax "3000" and the total amount including tax The amount "300" is read from the tax rate 2 total memory area 22d and displayed on the display unit 12 sequentially.

When [÷] [2] [=] is key-inputted for the four arithmetic operations while the total tax amount "300" is displayed, the CPU 21 calculates the number "300" displayed on the display unit 12 Then, the four arithmetic calculations of "300/2=150" are executed, and the numerical value "150" as the calculation result is displayed on the display unit 12. The number "150" is added to the number stored in the total memory area 22h. It should be noted that it is possible not only to display the total amount of tax and execute the arithmetic calculation, but also to display the total amount including tax or the total amount excluding tax and execute the arithmetic calculation.

When the CPU 21 detects that the [AC] key has been operated, the CPU 21 turns off the tax total recall mode and clears all the memory including the tax total memory areas 22b to 22f and the tax total memory area 22g. do.

Thus, the tax total recall mode is kept on until the [AC] key is operated. When the tax total recall mode is on, the numerical values stored in the tax total memory areas 22b to 22f by tax rate are displayed on the display unit 12 by operating the tax calculation key 11b, and are subject to normal calculation. can do.

In this manner, the calculator 10 of the present embodiment maintains the total tax recall mode in the ON state even if the normal calculation is performed while the total tax recall mode is ON. Then, each calculation result can be stored. Therefore, tax calculation and normal calculation can be mixed and easily executed. Also, the total amount (total amount including tax, total amount excluding tax, total tax amount) based on the tax calculation stored in the tax total memory area 22g, or calculation based on each tax rate stored in the tax rate 1 total memory area 22c The results (total amount including tax, total amount excluding tax, total amount including tax) can be displayed on the display unit 12 in response to key operation, and can be used for normal calculation. Therefore, it is possible to easily execute normal calculations targeting the results of tax calculations (numbers).

FIG. 12 is an example of a slip format used in retail stores in India, showing an excerpt from the column for entering the total amount. The slip is designed to allow you to enter figures for each of the five tax rates, starting from the top row, the total amount excluding tax for each tax rate, State GST (SGST) for each tax rate, Central GST (CGST) for each tax rate, and Inter-State GST (IGST), tax-included total amount by tax rate, and tax-included total amount are provided. A numerical value is entered in each column according to the tax calculation actually performed at the store.

Entry of numerical values into a slip will be described with reference to an input operation example shown in FIG. When the tax calculation total key 11c is operated immediately after tax calculation, the tax total recall mode is turned on, and the total tax-included total amount "3825" is displayed on the display unit 12 (line 6 in FIG. 11). The entry person sees this numerical value and transfers it to the "GTAND TOTAL" column in the slip (line 6 in FIG. 12). Subsequently, when the tax 2 calculation key 11b2 is operated, the second total amount including tax "3300" is displayed on the display unit 12 (line 14 in FIG. 11). A numerical value is transferred to the amount column (third column, fifth row in FIG. 12). When the tax 2 calculation key 11b2 is operated again, the second total amount excluding tax "3000" is displayed on the display unit 12 (line 15 in FIG. 11), and the entry person can calculate the total amount excluding tax of tax rate 2 in the slip. A numerical value is transferred to the amount column (third column, first row in FIG. 12). Next, when the tax 2 calculation key 11b2 is operated again, the total tax amount of tax rate 2 "300" is displayed on the display unit 12 (line 16 in FIG. 11), and then using the displayed numerical value, When the half of the total tax amount of tax rate 2 is calculated, "150" is displayed on the display unit 12 as the execution result of the normal calculation (line 18 in FIG. 11). The entry person transfers the numerical values to the SGST and CGST columns of tax rate 2 in the slip (column 3, row 2, row 3 in FIG. 12). In this example, it is assumed that there is no numerical value to be transferred to the IGST column. Although not shown in FIG. 10, by operating the tax 1 calculation key 11b1 while the tax total recall mode is on, the tax calculation result or the tax calculation result can be obtained for the tax rate 1 as well as for the tax rate 2. The results of the normal calculations of interest can be displayed and the numerical values can be transferred to each column of the slip as shown in the second column of FIG.

Thus, according to the calculator of the present embodiment, after the tax calculation is completed, the tax total recall mode is turned on, and then using the calculated total tax amounts, the SGST, CGST, or IGST can be calculated. Moreover, once the tax total recall mode is turned on, unless a specific operation ([AC] key operation) is performed, the tax total recall mode is kept on, and the tax total memory areas 22b to 22f by tax rate are kept on. and the respective numerical values stored in the tax total memory area 22g are held. Therefore, after the tax calculation is completed, the total tax amount (tax included amount/tax Amount excluding tax/amount of tax) or a total tax amount for each tax rate (amount including tax/amount excluding tax/amount of tax) can be called at any time and displayed on the display unit 12, and furthermore, normal calculation can be performed using the displayed numerical value. By executing this, the SGST, CGST, or IGST for the total tax amount or the total tax amount for each tax rate can be calculated at desired timing. Therefore, according to the calculator of this embodiment, in particular, when the total tax amount and the total tax amount by tax rate are not posted to the slip as they are, but are posted to the slip after performing normal calculation based on each numerical value. In addition, posting work to slips becomes easier.

It should be noted that the methods described in the embodiments, that is, each method such as the processing shown in the flowcharts of FIGS. flexible disk, hard disk, etc.), optical disk (CD-ROM, DVD, etc.), semiconductor memory, or other recording medium for distribution. Then, the computer reads the program recorded in the external recording medium, and by controlling the operation by this program, it is possible to implement the same processing as the functions described in the embodiments.

In addition, program data for realizing each technique can be transmitted over a network (Internet) in the form of program code. It is also possible to capture and implement functionality similar to the previously described embodiments.

It should be noted that the present invention is not limited to the embodiments, and can be variously modified in the implementation stage without departing from the gist of the invention. Furthermore, the embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some components are deleted from all the components shown in the embodiments, or some components are combined, the problems described in the column of problems to be solved by the invention can be solved, and the invention If the effect described in the effect column of 1 above can be obtained, a configuration in which this constituent element is deleted or combined can be extracted as an invention.

The invention described in the original claims of the present application is appended below.

[1] executing a first calculation using a numerical value in response to an input of an instruction to execute a first calculation, storing a first numerical value related to the result of the executed first calculation in a first memory, and displaying a display unit; to display
executing a second calculation using numerical values in response to an input of an instruction to execute a second calculation different from the first calculation, and storing a second numerical value related to the result of the executed second calculation in a second memory; , and displayed on the display unit,
When a first reading instruction is input while the numerical value indicating the result of the executed first calculation is being displayed on the display unit, the first numerical value stored in the first memory is displayed on the display unit. to display
displaying the second numerical value stored in the second memory when the first reading instruction is input while the numerical value indicating the result of the executed second calculation is being displayed on the display unit; A computer having a control unit to display on the unit.

[2] The control unit
The computer according to [1], which sets a read mode for displaying the first numerical value related to the result of the executed first calculation in response to an input of a read mode setting instruction.

[3] The computer according to [2], wherein the first readout instruction also serves as an instruction to set the readout mode.

[4] The control unit
In a state where the read mode is set,
executing a second calculation using the numerical value being displayed on the display unit without canceling the set read mode in response to the input of the instruction to execute the second calculation, and executing the executed second calculation; The computer according to [2] or [3], wherein a numerical value indicating the result is displayed on the display unit.

[5] The control unit
In a state where the read mode is set,
reading the first numerical value stored in the first memory and displaying it on the display unit in response to input of a second reading instruction;
executing the second calculation using the first numerical value being displayed on the display unit without canceling the set readout mode in response to the input of the instruction to execute the second calculation; The computer according to any one of [2] to [4], wherein the display unit displays a numerical value indicating the result of the second calculation.

[6] The computer according to [5], wherein the instruction to execute the first calculation also serves as the second read instruction.

[7] The control unit
In a state where the read mode is set,
The computer according to any one of [2] to [6], which cancels the set readout mode in response to input of a predetermined instruction.

[8] The control unit
In a state where the read mode is set,
The computer according to any one of [2] to [7], wherein the stored contents of the first memory are cleared in response to input of a predetermined instruction.

[9] The control unit
In a state where the read mode is set,
displaying the first numerical value stored in the first memory on the display unit when the first readout instruction is input, regardless of the display content of the display unit; [2] to [ 8].

[10] The control unit
In a state where the read mode is not set,
displaying the first numerical value stored in the first memory when the first reading instruction is input while the numerical value indicating the result of the executed first calculation is being displayed on the display unit; display in the department,
displaying the second numerical value stored in the second memory when the first reading instruction is input while the numerical value indicating the result of the executed second calculation is being displayed on the display unit; The computer according to any one of [2] to [9], which is displayed on the unit.

[11] The control unit
when an instruction to execute the first calculation related to the first tax rate is input, the tax calculation according to the first tax rate is executed, and a third numerical value related to the result of the tax calculation according to the first tax rate is stored in the first memory; remember,
When an instruction to execute the first calculation related to the second tax rate is input, the tax calculation according to the second tax rate is executed, and a fourth numerical value related to the result of the tax calculation according to the second tax rate is stored in the first memory. remember,
[2] to [10], wherein the reading mode is set according to the input of the first reading instruction, and the total sum of the third numerical value and the fourth numerical value is displayed on the display unit; A computer according to any one of the preceding paragraphs.

[12] The control unit
When an instruction to execute the first calculation related to any one tax rate among a plurality of tax rates is input, the tax calculation based on any one of the tax rates is executed, and the tax calculation based on any one of the tax rates is performed. storing a numerical value related to the result in the first memory;
In a state where the read mode is set,
[2] to [11] displaying a tax total obtained by totaling the numerical values indicating the results of tax calculations based on at least one of the tax rates, in response to an instruction to execute a function related to any one of the tax rates; ].

[13] The control unit
When a third readout instruction different from the first readout instruction is input while the numerical value indicating the result of the executed first calculation is being displayed on the display unit, the readout instruction is stored in the second memory. displaying the second numerical value on the display unit;
displaying the first numerical value stored in the first memory when the third reading instruction is input while the numerical value indicating the result of the executed second calculation is being displayed on the display unit; The computer according to any one of [1] to [12], which is displayed on the unit.

[14] The control unit
switching the calculation to be executed as the first calculation to either a tax-inclusive calculation or a tax-excluded calculation in response to an input of an instruction to switch the tax calculation mode;
when executing the tax-inclusive calculation as the first calculation, storing the first numerical value in the first memory;
The computer according to any one of [1] to [13], wherein the first numerical value is not stored in the first memory when the tax-excluded calculation is executed as the first calculation.

[15] By the computer of the calculator,
executing a first calculation using a numerical value in response to an input of a first calculation execution instruction, storing a first numerical value related to the result of the executed first calculation in a first memory, and displaying the first numerical value on a display unit; ,
executing a second calculation using numerical values in response to an input of an instruction to execute a second calculation different from the first calculation, and storing a second numerical value related to the result of the executed second calculation in a second memory; , and displayed on the display unit,
When a first reading instruction is input while the numerical value indicating the result of the executed first calculation is being displayed on the display unit, the first numerical value stored in the first memory is displayed on the display unit. to display
displaying the second numerical value stored in the second memory when the first reading instruction is input while the numerical value indicating the result of the executed second calculation is being displayed on the display unit; A program for displaying and functioning in the department.

[16] A calculation method executed by a control unit of a computer, comprising:
executing a first calculation using a numerical value in response to an input of a first calculation execution instruction, storing a first numerical value related to the result of the executed first calculation in a first memory, and displaying the first numerical value on a display unit; ,
executing a second calculation using numerical values in response to an input of an instruction to execute a second calculation different from the first calculation, and storing a second numerical value related to the result of the executed second calculation in a second memory; , and displayed on the display unit,
When a first reading instruction is input while the numerical value indicating the result of the executed first calculation is being displayed on the display unit, the first numerical value stored in the first memory is displayed on the display unit. to display
displaying the second numerical value stored in the second memory when the first reading instruction is input while the numerical value indicating the result of the executed second calculation is being displayed on the display unit; The calculation method to be displayed in the department.

10... calculator, 11... key input unit, 11b0... tax 0 calculation key, 11b1... tax 1 calculation key, 11b2... tax 2 calculation key, 11b3... tax 3 calculation key, 11b4... tax 4 calculation key, 11c... total tax calculation Key 11d Tax calculation mode switching key 12 Display unit 21 CPU 22 Memory 22a Calculation processing program 22b Total tax rate 0 memory area 22c Total tax rate 1 memory area 22d Total tax rate 2 Memory area 22e... Tax rate 3 total memory area 22f... Tax rate 4 total memory area 22g... Tax total memory area 22h... Total tax memory area 22k... Tax total recall mode area 22m... Tax calculation mode area.

The present invention relates to an electronic device, a calculation support method , and a program.

In addition, the tax calculator described in Cited Document 2 has multiple tax calculation keys (tax-inclusive calculation key, tax-excluded calculation key) corresponding to multiple tax rates, and a dedicated key for calculating the total amount including tax ( Tax calculation total key) and is provided. The tax calculator calculates and displays the tax-inclusive amount based on the tax rate corresponding to each tax calculation key based on the numerical values individually input according to the operation for each tax calculation key. Furthermore, the total amount including tax is calculated and displayed for each tax rate .

In the process of calculating each tax-inclusive amount, which is the basis for the total tax-inclusive amount for each tax rate, there are cases where the four arithmetic operations that are independent from that are required.

The present invention has been made in consideration of the above-mentioned problems, and the four arithmetic operations are executed independently from the calculation of each tax-inclusive amount, which is the basis of the total tax-inclusive amount for each tax rate. It is an object of the present invention to provide an electronic device, a calculation support method, and a program capable of preventing the four arithmetic operations from interfering with the derivation of the sum.

In order to solve the above problems, an electronic device according to the present invention is an electronic device capable of executing tax calculation for deriving an amount including tax, an amount excluding tax, or an amount of tax as a calculation result, wherein: A first operation key set with a first tax rate as an instruction is operated following numeric input, and a second operation key with a second tax rate set as an instruction to execute tax calculation is operated following numeric input. and when the tax calculation execution instruction is repeated, the calculation results are separately summed to obtain the first total value corresponding to the first tax rate and the second tax rate corresponding to the second tax rate. storage control means for storing the calculated second total value in a predetermined memory; display control means for displaying the calculation result of the tax calculation on a predetermined display unit each time the instruction to execute the tax calculation is repeated; When a predetermined four arithmetic operation is executed during the repetition, the storage control means stores the calculation result of the tax calculation executed after the four arithmetic operation before the four arithmetic operation. A first total value corresponding to the first tax rate and a second total value corresponding to the second tax rate are stored in the predetermined memory so as to be summed with the calculation result in the tax calculation. do.
Further, a calculation support method according to the present invention is a calculation support method executed by an electronic device capable of executing tax calculation for deriving a tax-inclusive amount, a tax-excluded amount, or a tax amount as a calculation result, wherein the tax calculation is executed A first operation key set with a first tax rate as an instruction is operated following numeric input, and a second operation key with a second tax rate set as an instruction to execute tax calculation is operated following numeric input. and when the tax calculation execution instruction is repeated, the calculation results are separately summed to obtain the first total value corresponding to the first tax rate and the second tax rate corresponding to the second tax rate. storage control processing for storing the calculated second total value in a predetermined memory; display control processing for displaying the calculation result of the tax calculation on a predetermined display unit each time the instruction to execute the tax calculation is repeated; and the memory control processing is such that, when a predetermined four arithmetic operation is executed during the repetition, the calculation result of the tax calculation executed after the four arithmetic operation is processed before the four arithmetic operation. A first total value corresponding to the first tax rate and a second total value corresponding to the second tax rate are stored in the predetermined memory so as to be summed with the calculation result in the tax calculation. do.
Further, the program according to the present invention provides a computer of an electronic device capable of executing tax calculation for deriving an amount including tax, an amount excluding tax, or an amount of tax as a calculation result. between the case where the first operation key is operated after entering a numerical value and the case where the second operation key for which the second tax rate is set as the instruction to execute the tax calculation is operated after entering a numerical value, A first total value corresponding to the first tax rate and a second total value corresponding to the second tax rate are predetermined by separately summing the calculation results when the tax calculation execution instruction is repeated. and display control means for displaying the calculation result of the tax calculation on a predetermined display unit each time the tax calculation execution instruction is repeated, and the storage control means When a predetermined four arithmetic operation is executed during the repetition, the calculation result of the tax calculation executed after the four arithmetic operation is summed with the calculation result of the tax calculation executed before the four arithmetic operation. , a first total value corresponding to the first tax rate and a second total value corresponding to the second tax rate are stored in the predetermined memory.

According to the present invention, even if the four arithmetic operations are executed independently from the calculation of each tax-inclusive amount, which is the basis of the total tax-inclusive amount for each tax rate, the four arithmetic operations can can be provided.

After that, when the numerical value "200" is input for tax calculation, the CPU 21 stores the input numerical value in the display memory area 22p and causes the display unit 12 to display it. Next, when the tax 1 calculation key 11b1 is operated, the CPU 21 causes the display section 12 to display the tax-inclusive amount "210" calculated based on the tax rate 1 and "GST+1" as the tax calculation key symbol 12c (Fig. 9 (B1)). Further, the CPU 21 causes the tax rate 1 total memory area 22c to store the result of the tax calculation using the tax rate 1 by the tax 1 calculation key 11b1. In this case, as shown in FIG. 8 (A), the total amount of tax rate 1 including tax "210", the total amount of tax rate 1 excluding tax "200", and the total tax amount of tax rate 1 "10" are stored in the tax rate 1 total memory area 22c. stored in At the same time, the tax-excluded amount "200" is stored in the buffer memory area 22n (not shown).

Next, when the numerical value "300" is input for tax calculation, the CPU 21 stores the input numerical value in the display memory area 22p and causes the display unit 12 to display it. Next, when the tax 1 calculation key 11b1 is operated, the CPU 21 causes the display memory area 22p to store the tax-inclusive amount "315" calculated based on the numerical value "300" being displayed on the display unit 12 and the tax rate 1. together with it, is displayed on the display unit 12 . At the same time, the CPU 21 causes the display unit 12 to display the tax calculation key symbol "GST+1" ((B3) in FIG. 9). Further, the CPU 21 causes the tax rate 1 total memory area 22c to store the result of the tax calculation using the tax rate 1 by the tax 1 calculation key 11b1. In this case, as shown in Figure 8 (A), the tax calculation result for the number "300" is the tax included amount of tax rate 1 "315", the tax excluded amount of tax rate 1 "300", and the tax amount of tax rate 1 "15". In addition, it is added to the previously stored tax rate 1 total tax amount "210", tax rate 1 tax total amount "200", and tax rate 1 total tax amount "10". As a result, the tax rate 1 total tax amount "525", the tax rate 1 tax total amount "500", and the tax rate 1 total tax amount "25" are stored in the tax rate 1 total memory area 22c. At the same time, the tax-excluded amount "300" is stored in the buffer memory area 22n (not shown).

Similarly, when the numerical value "1000" is input and the tax 2 calculation key 11b2 is operated, and then the numerical value "2000" is input and the tax 2 calculation key 11b2 is operated, the CPU 21 turns on the tax 2 calculation key 11b2. , the values entered immediately before are used as tax-excluded amounts, and the tax-inclusive amounts ("1100" and "2200") calculated based on each tax-excluded amount and tax rate 2 are displayed in the memory area 22p. , and sequentially displayed on the display unit 12 . At the same time, the CPU 21 causes the display unit 12 to display the tax calculation key symbol "GST+2" (FIGS. 9(B4) and (B5)). Further, the CPU 21 stores the result of the tax calculation using the tax rate 2 by the tax 2 calculation key 11b2 in the tax rate 2 total memory area 22d as shown in FIG. 8 (A). At the same time, the tax-excluded amount "1000" is first stored in the buffer memory area 22n, and then the tax-excluded amount "2000" is stored in the buffer memory area 22n (not shown).

When the tax calculation total key 11c is pressed normally after tax calculation is performed for a plurality of numerical values shown in FIGS. turn on the mode. In addition, the CPU 21 calculates tax rate 1 and Calculate the total tax-included total amount "3825" indicating the total tax-included total amount (525 + 3300) to which the tax rate 2 is applied respectively, store it in the tax total memory area 22g, and display it on the display unit 12 ( Fig. 8 (A) bottom 3rd line from FIG. 9 (C1)). Furthermore, the CPU 21 displays "RCL" as the total tax recall mode symbol 12d in the state display area of the display section 12 (Fig. 9 (C1)). Here, when the tax calculation total key 11c is operated, the CPU 21 displays the total tax-excluded total amount " 3500” is displayed. Further, when the tax calculation total key 11c is operated, the CPU 21 displays the total tax amount "325" indicating the total tax amount to which tax rate 1 and tax rate 2 are applied, as shown in FIG. 9 (C3). display. Further, when the tax calculation total key 11c is operated, the CPU 21 returns to the display shown in FIG. .

Claims (16)

executing a first calculation using a numerical value in response to an input of a first calculation execution instruction, storing a first numerical value related to the result of the executed first calculation in a first memory, and displaying the first numerical value on a display unit; ,
executing a second calculation using numerical values in response to an input of an instruction to execute a second calculation different from the first calculation, and storing a second numerical value related to the result of the executed second calculation in a second memory; , and displayed on the display unit,
When a first reading instruction is input while the numerical value indicating the result of the executed first calculation is being displayed on the display unit, the first numerical value stored in the first memory is displayed on the display unit. to display
displaying the second numerical value stored in the second memory when the first reading instruction is input while the numerical value indicating the result of the executed second calculation is being displayed on the display unit; display in the
A computer having a controller. The control unit
setting a readout mode for displaying the first numerical value related to the result of the executed first calculation in response to an input of a readout mode setting instruction;
A computer according to claim 1. The first readout instruction also serves as an instruction to set the readout mode.
A computer according to claim 2. The control unit
In a state where the read mode is set,
executing a second calculation using the numerical value being displayed on the display unit without canceling the set read mode in response to the input of the instruction to execute the second calculation, and executing the executed second calculation; causing the display unit to display a numerical value indicating the result;
The computer according to claim 2 or 3. The control unit
In a state where the read mode is set,
reading the first numerical value stored in the first memory and displaying it on the display unit in response to input of a second reading instruction;
executing the second calculation using the first numerical value being displayed on the display unit without canceling the set readout mode in response to the input of the instruction to execute the second calculation; causing the display unit to display a numerical value indicating the result of the second calculation;
The computer according to any one of claims 2 to 4. The instruction to execute the first calculation also serves as the second read instruction,
A computer according to claim 5. The control unit
In a state where the read mode is set,
canceling the set readout mode in response to input of a predetermined instruction;
The computer according to any one of claims 2 to 6. The control unit
In a state where the read mode is set,
clearing the stored contents of the first memory in response to input of a predetermined instruction;
The computer according to any one of claims 2 to 7. The control unit
In a state where the read mode is set,
causing the display unit to display the first numerical value stored in the first memory regardless of the display content of the display unit when the first readout instruction is input;
The computer according to any one of claims 2 to 8. The control unit
In a state where the read mode is not set,
displaying the first numerical value stored in the first memory when the first reading instruction is input while the numerical value indicating the result of the executed first calculation is being displayed on the display unit; display in the department,
displaying the second numerical value stored in the second memory when the first reading instruction is input while the numerical value indicating the result of the executed second calculation is being displayed on the display unit; display in the
The computer according to any one of claims 2 to 9. The control unit
when an instruction to execute the first calculation related to the first tax rate is input, the tax calculation according to the first tax rate is executed, and a third numerical value related to the result of the tax calculation according to the first tax rate is stored in the first memory; remember,
When an instruction to execute the first calculation related to the second tax rate is input, the tax calculation according to the second tax rate is executed, and a fourth numerical value related to the result of the tax calculation according to the second tax rate is stored in the first memory. remember,
setting the readout mode according to the input of the first readout instruction, and causing the display unit to display a total sum of the third numerical value and the fourth numerical value;
The computer according to any one of claims 2 to 10. The control unit
When an instruction to execute the first calculation related to any one tax rate among a plurality of tax rates is input, the tax calculation based on any one of the tax rates is executed, and the tax calculation based on any one of the tax rates is performed. storing a numerical value related to the result in the first memory;
In a state where the read mode is set,
displaying a tax total obtained by summing at least one numerical value indicating the result of tax calculation based on at least one of the tax rates, in response to an instruction to execute a function related to one of the tax rates;
The computer according to any one of claims 2 to 11. The control unit
When a third readout instruction different from the first readout instruction is input while the numerical value indicating the result of the executed first calculation is being displayed on the display unit, the readout instruction is stored in the second memory. displaying the second numerical value on the display unit;
displaying the first numerical value stored in the first memory when the third reading instruction is input while the numerical value indicating the result of the executed second calculation is being displayed on the display unit; display in the
The computer according to any one of claims 1 to 12. The control unit
switching the calculation to be executed as the first calculation to either a tax-inclusive calculation or a tax-excluded calculation in response to an input of an instruction to switch the tax calculation mode;
when executing the tax-inclusive calculation as the first calculation, storing the first numerical value in the first memory;
14. The computer according to any one of claims 1 to 13, wherein said first numerical value is not stored in said first memory when said tax-excluded calculation is executed as said first calculation. by computer computer
executing a first calculation using a numerical value in response to an input of a first calculation execution instruction, storing a first numerical value related to the result of the executed first calculation in a first memory, and displaying the first numerical value on a display unit; ,
executing a second calculation using numerical values in response to an input of an instruction to execute a second calculation different from the first calculation, and storing a second numerical value related to the result of the executed second calculation in a second memory; , and displayed on the display unit,
When a first reading instruction is input while the numerical value indicating the result of the executed first calculation is being displayed on the display unit, the first numerical value stored in the first memory is displayed on the display unit. to display
displaying the second numerical value stored in the second memory when the first reading instruction is input while the numerical value indicating the result of the executed second calculation is being displayed on the display unit; display in the
A program to make it work like A calculation method executed by a control unit of a computer,
executing a first calculation using a numerical value in response to an input of a first calculation execution instruction, storing a first numerical value related to the result of the executed first calculation in a first memory, and displaying the first numerical value on a display unit; ,
executing a second calculation using numerical values in response to an input of an instruction to execute a second calculation different from the first calculation, and storing a second numerical value related to the result of the executed second calculation in a second memory; , and displayed on the display unit,
When a first reading instruction is input while the numerical value indicating the result of the executed first calculation is being displayed on the display unit, the first numerical value stored in the first memory is displayed on the display unit. to display
displaying the second numerical value stored in the second memory when the first reading instruction is input while the numerical value indicating the result of the executed second calculation is being displayed on the display unit; display in the
Method of calculation.