JP7383902B2 - Calculators, calculation methods, and programs - Google Patents

Description

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

Some recent tax calculators (calculators) are equipped with a function to calculate taxes using preset tax rates. For example, the calculator described in Patent Document 1 performs any four arithmetic calculations, and when the tax-included key (confirmation key) is operated with the numerical value (amount) to be multiplied displayed, the displayed numerical value is The amount including tax is calculated and displayed based on the first tax rate. Similarly, when the tax-included key (confirmation key) is operated again, the tax-included amount based on the second tax rate is calculated and displayed 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-exclusive calculation key) corresponding to multiple tax rates, and a dedicated key (tax-inclusive calculation key) for calculating the total tax-inclusive amount (tax-inclusive calculation key). Tax calculation total key) is provided. Depending on the operation for each tax calculation key, the tax calculator calculates the tax-included amount at the tax rate corresponding to each tax calculation key, based on normally calculated numbers using any of the four arithmetic calculations, or individually input numbers. Calculate and display. Furthermore, the total amount including tax calculated based on each of the plurality of tax rates is calculated and displayed.

Japanese Patent Application Publication No. 10-143472 JP2017-174225A

Conventionally, by operating the same key as the key for displaying the first numerical value (for example, the total of tax calculations) related to the result of the first calculation (for example, tax calculation, etc.), a second calculation (for example, There is no known device that displays a second numerical value (for example, the total sum of normal calculations) related to the results of normal calculations. If the key input section is provided with a key for displaying the first numerical value and a key for displaying the second numerical value separately, the space for those two keys will be occupied.

The present invention has been made in consideration of the above-mentioned problems, and includes a calculator and a calculation method that can display numerical values related to the first calculation and numerical values related to the second calculation on a display based on the same operation, and programs.

In order to solve the above problems, a calculator according to the present invention executes a first calculation using a numerical value in response to an input of an instruction to execute a first calculation, and provides a numerical value indicating the result of the executed first calculation. is displayed on a display unit, and a first numerical value related to the result of the first calculation is stored in a first memory ,
In response to an input of an execution instruction for a second calculation different from the first calculation, a second calculation using numerical values is executed, and a numerical value indicating the result of the executed second calculation is displayed on a display unit, and A second numerical value related to the result of the second calculation is stored in a second memory, and while a numerical value indicating the result of the executed first calculation is displayed on the display section, a predetermined value is input as an input of the first read instruction. When a user performs an operation on an operation key in the first mode , the first numerical value stored in the first memory is displayed on the display unit , and the predetermined value is displayed as an input of a second reading instruction. When the user performs an operation on the operation key in the second mode, the second numerical value stored in the second memory is displayed on the display section to indicate the result of the executed second calculation. When a user performs an operation in the first mode on the predetermined operation key as an input of the first reading instruction while a numerical value is displayed on the display section, the above-mentioned information stored in the second memory While displaying the second numerical value on the display section, if the user performs an operation on the predetermined operation key in the second mode as an input of the second reading instruction, the second numerical value is displayed on the first memory. It is characterized by having a control section that causes the display section to display the stored first numerical value .
Further, the calculation method according to the present invention is a calculation method executed by a computer, in which a first calculation using numerical values is executed in response to an input of an instruction to execute the first calculation, and the calculation method is performed by a computer. Displaying a numerical value indicating the result on a display unit, and storing a first numerical value related to the result of the first calculation in a first memory, in response to input of an instruction to execute a second calculation different from the first calculation. , executing a second calculation using numerical values, displaying a numerical value indicating the result of the executed second calculation on a display unit, and storing a second numerical value related to the result of the second calculation in a second memory; , when the user performs an operation in the first mode on a predetermined operation key as an input of a first reading instruction while a numerical value indicating the result of the executed first calculation is being displayed on the display unit; While displaying the first numerical value stored in the first memory on the display unit, when the user performs an operation on the predetermined operation key in the second mode as an input of a second read instruction; , while displaying the second numerical value stored in the second memory on the display section and displaying the numerical value indicating the result of the executed second calculation on the display section, inputting the first reading instruction; When the user performs an operation on the predetermined operation key in the first mode, the second numerical value stored in the second memory is displayed on the display unit, while the second reading instruction is given. control processing for displaying the first numeric value stored in the first memory on the display unit when the user performs an operation in the second mode on the predetermined operation key as an input. It is characterized by
Further, the program according to the present invention causes the computer to execute a first calculation using numerical values in response to an input of an instruction to execute the first calculation, and displays a numerical value indicating the result of the executed first calculation on a display unit. a second calculation using the numerical values in response to input of an instruction to execute a second calculation different from the first calculation; to display a numerical value indicating the result of the executed second calculation on the display unit, store a second numerical value related to the result of the second calculation in a second memory, and display the numerical value indicating the result of the executed second calculation in a second memory. When a user performs an operation in the first mode on a predetermined operation key as an input of a first reading instruction while a numerical value indicating a result is displayed on the display section, the above-mentioned information stored in the first memory is While displaying the first numerical value on the display section, if the user performs an operation on the predetermined operation key in the second mode as an input of a second reading instruction, the first numerical value is stored in the second memory. The second numerical value that has been calculated 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 second numerical value is displayed on the display unit, and the second numerical value is displayed on the display unit. When the user performs an operation in one mode, the second numerical value stored in the second memory is displayed on the display unit, and the predetermined operation key is used as an input for the second reading instruction. When the user performs an operation in the second mode, the first numerical value stored in the first memory is displayed on the display unit.

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.

FIG. 1 is a front view showing the external configuration of the tax calculator according to the present embodiment. FIG. 1 is a block diagram showing the configuration of an electronic circuit of a calculator in this embodiment. 5 is a flowchart for explaining the operation of the tax calculation function of the calculator in this embodiment. 5 is a flowchart for explaining the operation of the tax calculation function of the calculator in this embodiment. 5 is a flowchart for explaining the operation of the tax calculation function of the calculator in this embodiment. 5 is a flowchart for explaining the operation of the tax calculation function of the calculator in this embodiment. 5 is a flowchart for explaining the operation of the tax calculation function of the calculator in this embodiment. FIG. 3 is a diagram showing a specific example of input operations and display for explaining the tax calculation function of the calculator in the present embodiment. FIG. 3 is a diagram showing a specific example of input operations and display for explaining the tax calculation function of the calculator in the present embodiment. FIG. 3 is a diagram showing a specific example of input operations and display for explaining the tax calculation function of the calculator in the present embodiment. FIG. 3 is a diagram showing a specific example of input operations and display for explaining the tax calculation function of the calculator in the present embodiment. A diagram showing an example of a slip format used at a retail store in India.

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 a tax calculator according to this embodiment. In this embodiment, the tax calculator is realized as a calculation-only calculator 10.

In addition to being configured as the calculator 10, the tax calculator may also include a personal computer with a calculation function (in which a calculation processing program is implemented), a tablet computer, a smartphone, a mobile phone, a touch-panel PDA (personal digital assistant), an electronic book, It can be configured as a portable game machine or the like. Note that tax calculators such as the calculator 10 that are not equipped with physical keys (buttons) display a software keyboard similar to the keys of the calculator 10, and perform calculation processing in response to key operations on this software keyboard. .

The calculator 10 in this embodiment is provided with a tax calculation function that calculates tax using a plurality of tax rates, for example, five different tax rates. For example, in India, five types of tax rates (0%, 5%, 12%, 18%, and 28%) are used as consumption tax. Therefore, the calculator 10 according to the present embodiment is suitable for tax calculations such as calculating the total amount of products for which five or less types of consumption taxes are mixed in countries such as India.

A key input section 11 including a plurality of keys, a display section 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 numerical keys, calculation keys, tax calculation function keys, function keys, and verification function keys. The numerical keys include, for example, a plurality of keys corresponding to each of [00][0] to [9]. Arithmetic keys include the [+] (addition) key 11h1, [-] (subtraction) key 11h2, [x] (multiplication) key 11h3, and [÷] (division) key 11h4, which are used for normal calculations using four arithmetic operations. , [=] (calculation execution) key 11h0.

Tax calculation function keys include tax calculation key ([GST+n (TAX-n)]) 11b, tax calculation total key ([GST GT (GT)]) 11c, and 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 parentheses) indicate the character strings printed on the key top of each tax calculation key 11b. For the sake of convenience, the character string shown in FIG. 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 are included. The 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 and tax 4 calculation key ([GST+4 (TAX-4)]) 11b4 are operated to input instructions for executing tax calculation using tax rate 1, tax rate 2, tax rate 3, and tax rate 4, respectively. In this specification, when expressed as 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, if there is no particular limitation on which number "n" can be among all possible numbers (integers from 0 to 4), a specific number is used. This will be explained using "n" instead of "n" for convenience.

One tax calculation key 11b (tax n calculation keys 11b0 to 11b4) serves as a tax-inclusive calculation key [GST+n] and a tax-excluding calculation key [TAX-n]. The tax calculation key 11b (tax n calculation keys 11b0 to 11b4) is the tax calculation key [GST+n] or the tax calculation key [GST+n] or Used as tax-excluding calculation key [TAX-n]. By sharing one tax calculation key 11b as a tax-included calculation key [GST+n] and a tax-excluded calculation key [TAX-n], you can effectively utilize the limited front area of the case and calculate multiple (5 types) Keys are provided that can execute tax-inclusive calculation processing and tax-exclusive calculation processing corresponding to each tax rate.

Note that 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 preset when the calculator 10 is shipped from the factory. For example, five types of tax rates (0%, 5%, 12%, 18%, 28%) are respectively set in the tax n calculation keys 11b0 to 11b4 in accordance with use in India. Further, 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 the grand total key ([GT] key) for displaying the total for normal calculations (basic calculations) such as four arithmetic calculations and constant calculations, and the tax calculation It also serves as the GST grand total key ([GST GT] key) for displaying the total of the calculation results. Note that when the tax calculation total key 11c functions as a GST grand total key, tax calculation is executed and the processing mode of the calculator 10 changes to tax total recall mode (GST GT recall mode). On the other hand, when the tax calculation total key 11c functions as a grand total key, the processing mode of the calculator 10 does not change in particular, and the numerical value stored in the total memory area 22h is simply called and displayed on the display unit 12. be done. These processes will be explained in detail later using FIG. 4.

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

Further, the tax calculation total key 11c functions as a key opposite to that described above when an operation different from a normal pressing operation (for example, a long press) is performed. That is, for example, if the tax calculation total key 11c is held down immediately after tax calculation is executed by operating the tax calculation key 11b, the tax calculation total key 11c is used as the grand total key ([GT] key). Function. Further, for example, if the tax calculation total key 11c is held down immediately after normal calculation is executed by operating the calculation execution key ([=] key) 11h0, that is, tax calculation is executed by operating the tax calculation key 11b. If the tax calculation total key 11c has not just been executed, the tax calculation total key 11c functions as a GST grand total key ([GST GT] key). Note that an operation other than the normal operation of the tax calculation total key 11c may be performed other than the above-mentioned long-press operation (operation of continuing to press the key for more than the above-described predetermined time). It is.

Function keys include, for example, an all clear key ([AC] key 11a), a clear key ([C] key), multiple memory keys ([MRC] [M-] [M+]), and a root key ([√] key). ), [%] key 11g, etc. The [%] key 11g is used not only for percentage calculation, but also for setting the tax rate corresponding to each of the tax calculation keys 11b (tax n calculation keys 11b0 to 11b4) to the value input by key operation. Used to launch the configuration process.

The verification function key is a key used in the verification function for confirming/correcting the contents of a previously executed calculation. The verification function keys include a confirmation key ([CHECK BACK] key 11e, [CHECK FOWARD] key 11f) and a correction key ([CORRECT] key) 11k. The [CHECK BACK] key 11e and the [CHECK FOWARD] key 11f are keys for switching and displaying the content (calculation data) of the previously executed calculation in units of steps. When the [CHECK BACK] key 11e is operated, the display is switched to the calculated data of the step with the smaller number of steps, and when the [CHECK FOWARD] key 11f is operated, the display is switched to the calculated data of the step with the larger number of steps. Switch display. Note that the unit of one step is "set number + function" input for calculation. "Function" stores the codes of keys operated for four arithmetic calculations, tax-inclusive calculations, tax-excluding calculations, etc. The modification key 11k is a key for instructing modification of the content of the calculation ("position number + function") displayed by operating the [CHECK BACK] key 11e or the [CHECK FOWARD] key 11f. By inputting the content of the revised calculation after operating the modification key 11k, it is possible to modify the previously input calculation data displayed.

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

The display section 12 consists of a dot matrix type liquid crystal display unit. The display unit 12 displays numerical values input by operating the keys on the key input unit 11. The display unit 12 displays numerical values in a limited number of lines (for example, one line). Further, in the status display area provided along the side of the display unit 12, characters and symbols indicating the calculation mode being set and various setting states are displayed. For example, the status display area displays a step number 12a, a tax calculation mode symbol 12b, a tax calculation key symbol 12c, a tax total recall mode symbol 12d, a grand total display symbol 12e, a memory symbol 12f, and the like. In FIG. 1, in order to explain the status display area, all the symbols that can be displayed are conveniently shown on the same screen. They may not always be displayed on the screen at the same time.

The step number 12a indicates the position of the step currently being displayed, where "set number + function" input by operating a key on the key input unit 11 is one step. The tax calculation mode symbol 12b indicates the current tax calculation mode; for example, [GST+] is displayed in the tax-inclusive calculation mode where tax-inclusive calculation is performed, and [GST+] is displayed in the tax-exclusive calculation mode where tax-exclusive calculation is performed. For example, [TAX-] is displayed.

The tax calculation key symbol 12c is a symbol that indicates the tax rate used for tax calculation and either tax-inclusive calculation or tax-exclusive calculation when tax calculation is executed by operating the tax calculation key 11b. When the tax calculation key 11b is used as the tax-included 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. In addition, when the tax calculation key 11b is used as the tax-excluding calculation key [TAX-n], [TAX-0], [TAX-1], [TAX-2], [ Either [TAX-3] or [TAX-4] will be displayed.

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

The grand 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, and for example, "GT" is displayed. Ru. The memory symbol 12f is a symbol indicating that a numerical value is stored by the memory function in response to the operation of the memory keys ([M-][M+]).

The solar panel 13 generates electricity when the ambient light when the calculator 10 is used is bright to a certain extent. During power generation, the solar panel 13 functions as a power supply section 26 (shown in FIG. 2) of the calculator 10, and supplies power to each section of the calculator 10. Furthermore, 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 section 26 that the calculator 10 includes separately.

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

The CPU 21 controls the operation of each part of the circuit by executing a calculation processing program 22a stored in the memory 22. When an input operation is performed on the key input unit 11, the CPU 21 detects the input key 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 according to instructions written in the calculation processing program 22a, and the software and hardware work together to perform the processing by the calculation function described in the operation description below. Achieve calculation processing including

The calculation processing program 22a may be stored in the memory 22 in advance, 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 also be downloaded from the server 30 on the network N (including the Internet, etc.).

In addition to storing a calculation processing program 22a, the memory 22 includes an area for storing calculation results of tax calculations (tax memory), a total memory area 22h, a tax total recall mode area 22k, a tax calculation mode area 22m, and a buffer memory. Areas for storing various data are provided, such as an area 22n, a display memory area 22p, and a tax rate storage area 22r. 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 explanation, 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 total tax rate 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 a zero tax rate. The zero tax rate total memory area 22b stores numerical values based on the results of tax-inclusive calculations for a zero tax rate. Specifically, the tax-inclusive amount (0th tax-inclusive amount), the tax amount (0th tax-inclusive amount), and Each total amount of the tax-excluded amount (0th tax-excluded amount) is stored as the 0th tax-included total amount, the 0th tax-excluded total amount, and the 0th total tax 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 described above. This is an area for storing data calculated by tax calculations. A detailed explanation will be 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 to 4. In the tax total memory area 22g, in accordance with the input operation of the tax calculation total key 11c, the total amount including tax, which is the sum of the 0th to 4th total including tax, the total amount excluding tax corresponding to the total amount including tax, and the total amount including tax The total tax amount corresponding to the total amount is stored.

The total memory area 22h is an area for storing data indicating the total of numerical values calculated by normal calculation (second memory). In the total memory area 22h, the calculation result of the normal calculation is calculated in response to the operation of the calculation 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 tax total recall mode area 22k, a tax total recall mode flag indicating whether or not the tax total recall mode is in the recall mode 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 held down immediately after normal calculation. (Transition to tax total recall mode). Further, the tax total recall mode is turned off when, for example, the [AC] key 11a is operated as a predetermined instruction for turning off the tax total recall mode. Note that switching on/off 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, the tax total recall mode may be turned on or off in response to another key operation or in response to a processing result of the calculator 10.

When the tax total recall mode is on, each time the tax calculation total key 11c is operated (pressed), the tax-included total amount, tax-excluded total amount, and tax total stored in the tax total memory area 22g are recalled. You can change the amount displayed. Furthermore, when the tax total recall mode is on, each time the tax calculation key 11b (tax n calculation keys 11b0 to 11b4) is operated (pressed), the tax total by tax rate memory area 22b to 22f is stored. , you can switch between displaying the total amount including tax, total amount excluding tax, and total amount including tax.

The ON state of the tax total recall mode is maintained even when the numerical keys and calculation keys of the key input unit 11 are input. Therefore, it is possible to perform normal calculations using the numerical keys and calculation keys while displaying and confirming the tax calculation results by inputting the tax calculation total key 11c or the tax calculation keys 11b (11b0 to 11b4). In normal calculation when the tax total recall mode is on, the numerical value resulting from the tax calculation is displayed on the display section 12, and four arithmetic calculations can be performed on the number displayed on the display section 12. .

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

In the buffer memory area 22n, input numbers are stored in pairs with the last input function to form a unit. Further, the display memory area 22p stores the numerical value displayed on the display unit 12 at that time. For example, if the numerical value "100" is operated as a numeric key and the tax 1 calculation key ([GST+1 (TAX-1)]) 11b1 is operated as a function in sequence, the buffer memory area 22n is stored as a numeric value. The numerical value "100" is stored in the display memory area 22p, and the numerical value "105" which is also displayed on the display unit 12 as a result of the tax-inclusive calculation for the tax rate 1 is stored in the display memory area 22p (however, if the tax rate 1 is 5%), if you did this). In this way, each numerical value stored in the buffer memory area 22n and the display memory area 22p is 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 each of the tax calculation keys 11b (tax n calculation keys 11b0 to 11b4). For example, five types of tax rates (0%, 5%, 12%, 18%, 28%) are set for the tax n calculation keys 11b0 to 11b4 at the time of shipment from the factory, depending on the use in India. In this case, the tax rate storage area 22e contains "0", "5", "12", "18", and "28" for each of the tax rates 0 to 4 corresponding to the tax n calculation keys 11b0 to 11b4. The numerical value is memorized.

Next, the operation of the calculator 10 in this embodiment will be explained. 3, FIG. 4, FIG. 5, FIG. 6, and FIG. 7 are flowcharts for explaining the operation of the tax calculation function of the calculator 10 in this embodiment. 8, FIG. 9, FIG. 10, and FIG. 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, for convenience, the tax rate 1 corresponding to the tax 1 calculation key ([GST+1(TAX-1)]) 11b1 is assumed to be 5%.

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 memory areas 22b to 22f of tax total memory areas 22b to 22f, the total tax memory area 22g, the total memory area 22h, the buffer memory area 22n, and the display area of the memory 22. The entire memory area 22p is cleared (step A12). Further, the CPU 21 turns off the tax total recall mode flag stored in the tax total 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 section 12, the CPU 21 clears the previously displayed symbol and makes it invisible.

If an input operation on the tax calculation key 11b (any of the tax n calculation keys 11b0 to 11b4) is detected immediately after the input operation on the [AC] key 11a (step A19: Yes), A117: Yes), the CPU 21 The tax rate set for any of the tax n calculation keys 11b0 to 11b4 on which the input operation was performed is read out from the tax rate storage area 22r of the memory 22 and displayed on the display section 12 (step A118). For example, if 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 in the tax 1 calculation key 11b1 in the tax rate storage area. 22r and display "5" on the display section 12.

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

That is, immediately after the input operation of the [AC] key 11a, by successively operating any of the tax calculation keys 11b (tax n calculation keys 11b0 to 11b4), the input operation for each tax calculation key 11b is performed. The set tax rates 0 to 4 can be continuously switched and displayed. Note that after the last input operation of the [AC] key 11a, if only the input operation of the tax calculation key 11b is performed two or more times in a row, the input operation of the tax calculation key 11b from the second time onwards will be , strictly speaking, is not performed immediately after the input operation of the [AC] key 11a, but in this specification, such an input operation also refers to the input operation performed immediately after the input operation of the [AC] key 11a. regarded as. Furthermore, 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 will be performed using the [AC] key. It is assumed that the input operation is not performed immediately after the input operation in step 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 (numeric code) corresponding to the operated numerical key. , the input numerical value is stored in the display memory area 22p and displayed on the display section 12 (step A15).

Subsequently, when a calculation key is operated (step A11: Yes), the CPU 21 inputs the calculation (operation code) corresponding to the input operation key and displays the calculation (symbol) symbol of the input calculation. It is displayed in the status display area of the display section 12 (step A16).

Further, the CPU 21 executes an operation based on the input arithmetic code and the already input numerical code, stores the numerical value of the result during the operation in the display memory area 22p, and displays it on the display unit 12. Thereafter, by repeating the input of numerical codes and operational codes in the same way, the CPU 21 sequentially stores the input numerical codes and operational codes. Then, when the calculation execution key "=" (equal) 11h0 is operated by the user (step A17: Yes), the CPU 21 inputs the calculation code corresponding to the input operation execution key ("=" key) 11h0. It executes calculation according to the numerical code and operation code input so far, and stores the numerical value of the calculation result in the display memory area 22p and displays it on the display unit 12. Further, the CPU 21 stores the numerical value that is the result of the normal calculation according to the numerical code and the operation code in the total memory area 22h (step A18). If a numerical value has already been stored in the total memory area 22h, the CPU 21 adds the numerical value resulting from the normal calculation to the previously stored numerical value and stores the result in the memory 22. If the calculation execution key "=" (equal) 11h0 is not operated by the user (step A17: No), the CPU 21 returns to the input operation standby state.

If an input operation of the tax calculation key 11b is detected in a state where a numerical value is displayed on the display unit 12 other than immediately after the input operation of the [AC] key 11a (step A19: Yes → A117: No), the CPU 21 The tax rate set in any of the tax n calculation keys 11b0 to 11b4 on which the input operation was performed with respect to the numerical value (number) displayed on the display unit 12, that is, the numerical value stored in the display memory area 22p. Perform tax calculations using . Note that the numerical value to be subjected to tax calculation is not limited to the numerical value displayed by normal calculation, but may be the numerical value input simply by the input operation of the numerical key.

The tax calculation key 11b (each of the tax n calculation keys 11b0 to 11b4) serves as a key for executing tax-inclusive calculations and a key for executing tax-excluding calculations. When the tax calculation key 11b is operated, the CPU 21 refers to the tax calculation mode area 22m and determines whether the current tax calculation mode is the tax-inclusive calculation mode or the tax-exclusive 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 result of the tax calculation in response to a key operation. (Step A111). Further, if the current tax calculation mode is the tax-excluding calculation mode (step A110, tax-excluding), the CPU 21 executes the tax-excluding calculation and displays the result of the tax calculation according to the key operation. (Step A112).

Note that the tax calculation mode can be 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 and determines whether the current tax calculation mode is a tax-inclusive calculation mode or a tax-exclusive calculation mode. Determine if there is.

Here, 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-excluding 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-excluding calculation mode in the status display area of the display unit 12 (step A116).

On the other hand, if the current tax calculation mode is the tax-excluding 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-inclusive calculation mode in the status display area of the display unit 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 stores the calculation results (total amount excluding tax, total amount including tax, total amount including tax) stored in the total tax rate memory areas 22b to 22f. ) remain as is. Therefore, when performing a tax-inclusive calculation and a tax-excluding calculation in a mixed manner, even if the tax calculation mode is switched, the calculation results in the middle of the calculation are retained.

Next, tax-inclusive 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 a tax rate 0 calculation process 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 the tax rate 1 calculation process (step B10), and when the tax 2 calculation key 11b2 is operated, the CPU 21 executes the tax rate 1 calculation process (step B10). (Step B3: Yes), executes the tax rate 2 calculation process (step B3), and if the tax 3 calculation key 11b3 is operated (step B4: Yes), executes the tax rate 3 calculation process (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, the tax rate 1 calculation process, the tax rate 2 calculation process, the tax rate 3 calculation process, and the tax rate 4 calculation process each execute basically the same process. Here, the tax rate 1 calculation process will be explained, and detailed explanations of other calculation processes 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 CPU 21 detects an input operation of the tax 1 calculation key 11b1 (step B2: Yes), the CPU 21 determines whether the tax total recall mode is in the off state by referring to the tax total recall mode area 22k. The tax total recall mode is turned on by operating the tax calculation total key 11c. Transition of the tax total recall mode to the on state is executed in step A28, which will be described later.

Here, if the tax total recall mode is off (step B21: Yes), the CPU 21 reads out the numerical value (number) stored in the display memory area 22p, and sets the read out numerical value as the tax-excluding amount. The tax-inclusive amount and tax amount are calculated based on the tax-excluding amount and the tax rate 1 ("5%"), which is the tax rate corresponding to the tax calculation key 11b where the input operation was performed. and the tax-excluded amount indicated by the numerical value being displayed are both 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 the 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-included amount calculated based on the tax rate 1 (step B24).

Note that if step B22 has been executed one or more times before step B22 is executed this time after the last input operation of the [AC] key 11a, the previously executed one or more times The tax-excluding amount or its total amount, the tax-included amount or its total amount, and the tax amount or its total amount calculated in step B22 have already been stored in the tax rate 1 total memory area 22c before executing step B22 this time. There will be. Therefore, when executing step B22, if the tax-exclusive amount or its total amount, the tax-included amount or its total amount, or the tax amount or its total amount is already stored in the tax rate 1 total memory area 22c, the tax amount or its total amount is already stored. 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 or the total amount, the tax-included amount or the total amount, and the tax amount or the total amount, respectively. . In this way, the tax rate 1 total memory area 22c stores the tax-excluded information obtained from one or more tax-inclusive calculations for all tax rates 1 (step B22) executed after the last input operation of the [AC] key 11a. The total amount, tax-included amount, and tax amount are stored.

In this way, the CPU 21 can successively instruct tax-inclusive calculations for a plurality of numerical values (numbers) in response to input operations on the tax 1 calculation key 11b1.

Note that while the tax-included amount is displayed, by successively operating the tax 1 calculation key 11b1 that was operated to instruct tax calculation, the display can be switched between the tax-included amount, the tax-exclusive amount, and the tax amount. . For example, when the tax-included 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 displayed numerical value (number) is read out and displayed as the amount excluding tax (step B26). As described above, at this time, that is, immediately after the tax-inclusive calculation (immediately after executing steps B22 and B23), the numerical value of the tax-exclusive amount used in the tax-inclusive calculation is stored in the buffer memory area 22n. Further, when the tax-excluded amount is displayed (step B26), if the tax 1 calculation key 11b1 is operated (step B27: Yes), the CPU 21 calculates the numerical value (tax-excluded amount) stored in the buffer memory area 22n. ), the tax amount is calculated anew based on the read numerical value and tax rate 1, and the calculated numerical value is displayed on the display unit 12 (step B28). Furthermore, when the tax 1 calculation key 11b1 is operated continuously (step B29: Yes), the CPU 21 reads out the numerical value (excluding tax amount) stored in the buffer memory area 22n, and calculates the read numerical value and tax rate 1. The tax-included amount is calculated again, and the calculated value is displayed on the display unit 12 (step B24).

In this way, 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, tax-exclusive amount, and tax amount for each operation of the tax 1 calculation key 11b1. , can be switched and displayed. Therefore, the amount including tax, the amount excluding tax, and the amount of tax can be easily confirmed.

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

Furthermore, when the tax 1 calculation key 11b1 is operated while the first tax-included total amount is displayed (step B31, Yes), the CPU 21 calculates the data corresponding to 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 selects the number corresponding to the first tax-included total amount from the tax rate 1 total memory area 22c. The total tax amount (total tax amount) 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 out the first tax-included 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 amount including tax, the first total amount excluding tax, and the first total amount calculated based on tax rate 1 for each operation on the tax 1 calculation key 11b1. You can sequentially switch to displaying the total amount. Therefore, after calculating tax using tax rate 1 for multiple numbers, the total amount including first tax, total amount excluding first tax, and total amount after first tax can be easily calculated as the calculation results of multiple tax calculations using tax rate 1. can be confirmed.

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

For example, if it is detected that the tax 0 calculation key 11b0 has been operated in a state where any of the first total amount including tax, the first total amount excluding tax, or the first total amount is displayed (step B31: No, Step B33: No, Step B35: No→Step B36: Yes), the CPU 21 shifts to zero tax rate 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 (the total tax-included amount at a tax rate of 0) from the zero tax rate total memory area 22b and displays it, as in step B30 described above. Further, when the tax 0 calculation key 11b1 is operated while the 0th tax-included total amount is displayed, the CPU 21 calculates the 0th tax-excluded total amount (tax rate 0 (total amount excluding tax) and display it. Further, when the tax 0 calculation key 11b0 is operated while the 0th tax-excluded total amount is displayed, the CPU 21 calculates the 0th tax total amount (tax rate 0 (total tax amount) 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 the tax rate 2 calculation process (step B7) and executes the same process as described above. Further, 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. If detected (step B27: Yes), the process moves to tax rate 4 calculation processing (step B9), and the same processing as described above is executed. Note that when it is detected that the tax calculation total key 11c has been operated (step B40: Yes), the CPU 21 performs a process of displaying the total amount including tax, total amount excluding tax, and total amount calculated at each tax rate. (processing of steps A29 to A214, which will 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 standby state. Note that when the operation of the tax 1 calculation key 11b1 is detected 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, as shown in FIG. Shift (step B10).

In each calculation process for tax rates 0 to 4, while the tax total recall mode is on, each tax calculation key 11b corresponding to another tax rate is operated, thereby corresponding to the operated tax calculation key 11b. It is possible to move to another calculation process and display the tax-included total amount, tax-excluded total amount, and tax total amount calculated based on the tax rate corresponding to the other calculation process.

Therefore, when the tax total recall mode is on, by selecting any of the multiple tax calculation keys 11b (11b0 to 11b4), the tax rate will be calculated using the tax rate corresponding to the operated tax calculation key 11b. You can easily check the total amount including tax, total amount excluding tax, and total amount including tax.

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

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

Note that while the tax-excluded amount is displayed, the display of the tax-excluded amount and the tax amount can be switched by continuously operating the tax 1 calculation key 11b1 that was operated to instruct tax calculation. For example, when the tax-excluded amount calculated based on the tax rate 1 is displayed (step C3), if the tax 1 calculation key 11b1 is operated (step C4: Yes), the CPU 21 stores the tax in the buffer memory area 22n. The stored numerical value (tax-included amount) is read out, the tax amount is calculated anew 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). Furthermore, when the tax 1 calculation key 11b1 is operated continuously (step C6: Yes), the CPU 21 reads out the numerical value (excluding tax) 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 displaying the tax-excluded amount and the tax amount each time the tax 1 calculation key 11b1 is operated. It can be displayed. Therefore, the amount excluding tax and the amount of tax can be easily confirmed.

In addition, in the tax-excluding 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 on the tax calculation key 11b is reflected (added) to the tax rate 1 total memory area 22c, but in the tax-excluding calculation process, the calculation result is reflected in the tax rate 1 total memory area 22c. It will not be reflected in

On the other hand, in step C3, the numerical value calculated by the tax-excluding calculation (tax-excluding amount) can be used as a number to continue executing tax-inclusive calculations or normal calculations using another tax rate.

For example, in markets such as India that use multiple consumption tax rates, prices are expressed as MRP (abbreviation for Maximum Retail Price). Therefore, when performing tax-inclusive calculations using a different tax rate based on the tax-inclusive amount, the tax-inclusive amount must be returned to the tax-exclusive amount, and then the tax-inclusive calculation must be performed again according to the other tax rate. It is necessary to find the amount, tax included amount, and tax amount.

In the calculator 10 according to the present embodiment, when tax-inclusive calculations (tax-excluded total amount, tax-included total amount, tax total amount) are being performed on multiple numerical values, if tax-exclusive calculation is required as described above, , even if the tax calculation mode is switched from the tax-inclusive calculation mode to the tax-exclusive calculation mode, the data (calculation results up to the middle of the calculation) in the tax rate-specific tax total memory areas 22b to 22f corresponding to each tax rate 0 to 4 will be discarded (cleared). ) is not done. Therefore, even if the calculator 10 performs both tax-inclusive calculations and tax-exclusive calculations, the tax calculation mode can be switched and executed as necessary, so that tax calculations can be performed efficiently.

Next, a process corresponding to an 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. 4. The tax calculation total key 11c includes a grand total key ([GT] key) for displaying the grand total for normal calculations (basic calculations), and a GST grand total key ([GT] key) for displaying the grand total for tax calculation results. [GST GT] key).

When the CPU 21 detects the operation of the tax calculation total key 11c (step A21: Yes), the CPU 21 determines whether the tax total recall mode flag is on (step A22). If the CPU 21 determines that the tax total recall mode flag is in the on state (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 or not 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 content of the display unit 12. If it is determined that is in the on state (step A22: Yes), the process advances to step A29. If it is determined that the tax total recall mode flag is in the on state (step A22: No), the operation on the tax calculation total key 11c is a normal press (less than a predetermined time, an operation that continues to be pressed), or It is determined whether it is a long-press operation (an operation that continues to be pressed for a predetermined period of time or more).

If it is determined that this is a normal pressing operation (step A23: No), the CPU 21 determines whether the operation immediately before the tax calculation total key 11c was pressed was for tax calculation. That is, the CPU 21 determines whether the tax calculation total key 11c was operated immediately after calculating the tax in response to the operation of the tax calculation key 11b, or in other words, whether the tax calculation total key 11c was operated subsequent to 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, which is 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 totals the tax-included amount, tax-excluded total amount, and tax total amount calculated based on the tax rates 0 to 4 stored in the tax rate-specific 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 tax total memory area 22g. Further, the CPU 21 stores the calculated total amount including tax in the display memory area 22p and displays it on the display unit 12 (step A29).

If the tax calculation total key 11c is operated while the tax-included total amount is displayed (step A29) (step A210: Yes), the CPU 21 reads the tax-excluded total amount from the tax total memory area 22g, It is stored in the display memory area 22p and displayed on the display unit 12 instead of the total amount including tax (step A211).

Further, when the total amount excluding tax is displayed (step A211), if the tax calculation total key 11c is operated (step A212, Yes), the CPU 21 reads the total tax amount from the tax total memory area 22g. Then, it is stored in the display memory area 22p and displayed on the display section 12 instead of the total amount excluding tax (step A213).

Furthermore, 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 the total tax-inclusive amount from the tax total memory area 22g. , is stored in the display memory area 22p and displayed on the display unit 12 instead of the total tax amount (step A29).

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

On the other hand, if the CPU 21 determines that the operation immediately before the tax calculation total key 11c was pressed was not tax calculation, that is, the tax calculation total key 11c was operated immediately after normal calculation (step A26: No), the total memory area The numerical value that is the 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, which is operated immediately after normal calculation, is used as a grand total key ([GT] key) for displaying the total calculated by normal calculation.

In this way, in the calculator 10 according to the present embodiment, one tax calculation total key 11c is provided on the front surface of the case with a limited area, and a grand total key ([GT] key) and a GST grand total key ([GST GT] key) are provided. ). The function of the tax calculation total key 11c can be switched depending on the previous state (immediately after tax calculation, immediately after normal calculation), so it can be used to display the total tax calculation total (total amount including tax, total amount excluding tax, total amount including tax). The total sum of normal calculations can be easily displayed.

Note that when the CPU 21 detects an operation on the tax calculation total key 11c (step A21: Yes), and when it determines that the operation on the tax calculation total key 11c is a long press operation (step A23: Yes), the CPU 21 performs the above-mentioned tax calculation. Processing is performed so as to display the calculation result opposite to that when the calculation total key 11c is pressed.

That is, when the tax calculation total key 11c is held down (step A23: Yes), the CPU 21 determines that the operation of the tax calculation total key 11c was performed immediately after tax calculation ( Step A24: Yes), the numerical value that is 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).

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

In this way, by pressing and holding the tax calculation total key 11c, it is possible to execute a process that is the reverse of the normal operation of pressing the tax calculation total key 11c. As a result, regardless of whether or not tax calculation was performed immediately before operating the tax calculation total key 11c, the total of tax calculation (total amount including tax, total amount excluding tax, total amount of tax) and the total of normal calculation The display can be easily switched between the total and total by simply changing the operating time (pressing time) of the tax calculation total key 11c.

Next, an example of specific numerical value input and tax calculation in this embodiment will be explained. Here, for ease of explanation, we will explain the tax calculation using two tax 1 calculation keys 11b1 [GST+1] (tax rate 1 (5%)) and tax 2 calculation key 11b2 [GST+2] (tax rate 2 (10%)). An example of calculation will be explained. The 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 way as when the tax 1 calculation key 11b1 and the tax 2 calculation key 11b2 are operated. Further explanations will be omitted.

8A and 8B show specific key operations used in the following explanation, 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 calculations stored in the total memory area 22h are shown. The key operations shown in FIGS. 8(A) and 8(B) show an example in which tax calculation and normal calculation are executed in a mixed manner. 8(A) shows the key operation when the operation immediately before the tax calculation total key 11c is operated is tax calculation, and FIG. 8(B) shows the key operation when the operation immediately before the tax calculation total key 11c is operated is tax calculation. Shows key operations for non-calculations. FIG. 9 shows an example of the 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 total tax rate 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 will input [GST+], and if it determines that it is the tax-excluding calculation mode, it will input [TAX-]. , is displayed in the status display area of the display section 12 as the tax calculation mode symbol 12b. As mentioned above, operating the [AC] key 11a does not change the tax calculation mode, so FIG. This is a display example.

Thereafter, 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 displays it on the display unit 12. Next, when the tax 1 calculation key 11b1 is operated, the CPU 21 causes the display unit 12 to display the tax-included amount "210" calculated based on the tax rate 1 and "GST+1" as the tax calculation key symbol 12c (see FIG. 9(B1)). Further, the CPU 21 stores the result of the tax calculation using the tax rate 1 using the tax 1 calculation key 11b1 in the tax rate 1 total memory area 22c. In this case, as shown in FIG. 8A , the tax-included total amount of tax rate 1 is "210", the tax-excluding total amount of tax rate 1 is "200", and the tax total amount of tax rate 1 is "10" in the tax rate 1 total memory area 22c. is memorized. 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 the normal calculation of "100 x 7 = 700", The calculation result "700" is stored in the display memory area 22p and displayed on the display unit 12 (FIG. 9 (B2)). Further, the CPU 21 stores the calculation results of the normal calculation in the total memory area 22h. Furthermore, the CPU 21 displays "GT" in the status display area of the display unit 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 displays it on the display unit 12. Next, when the tax 1 calculation key 11b1 is operated, the CPU 21 stores the tax-included amount "315" calculated based on the numerical value "300" displayed on the display unit 12 and the tax rate 1 in the display memory area 22p. It is also displayed on the display unit 12. At the same time, the CPU 21 displays the tax calculation key symbol "GST+1" on the display unit 12 (FIG. 9 (B3)). Further, the CPU 21 stores the result of the tax calculation using the tax rate 1 using the tax 1 calculation key 11b1 in the tax rate 1 total memory area 22c. In this case, the tax calculation results for the numerical value "300" are the tax-included amount "315" for tax rate 1, the tax-exclusive amount "300" for tax rate 1, and the tax amount "15" for tax rate 1 as shown in Figure 8 (A). are added to the previously stored total amount including tax for tax rate 1 "210", total amount excluding tax for tax rate 1 "200", and total amount of tax for tax rate 1 "10", respectively. As a result, the total amount including tax for tax rate 1 "525", the total amount excluding tax for tax rate 1 "500", and the total tax amount for tax rate 1 "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 inputs the tax 2 calculation key 11b2. For each operation, display the tax-included amount of tax rate 2 ("1100", "2200") calculated based on each tax-exclusive amount and tax rate 2, using each numerical value entered immediately before as the tax-excluding amount.Memory area 22p The information is sequentially stored in the display section 12 and sequentially displayed on the display section 12. At the same time, the CPU 21 displays the tax calculation key symbol "GST+2" on the display unit 12 ((B4) (B5) in FIG. 9). Further, the CPU 21 stores the result of the tax calculation using the tax rate 2 using 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).

In this way, the calculator 10 in 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 there are multiple products with different applicable tax rates, you can specify the tax rate for each item and enter the tax-inclusive amount. . Furthermore, the results of tax calculation (amount including tax, amount excluding tax, and tax amount) for the tax 1 calculation key 11b1 or the tax 2 calculation key 11b2 are stored separately in the tax rate 1 total memory area 22c and the tax rate 2 total memory area 22d. You can keep it. Therefore, as will be described later, in the tax total recall mode, the results of tax calculation can be displayed for each tax rate in response to the operation of the tax 1 calculation key 11b1 or the tax 2 calculation key 11b2.

9 (C1) to (C3) and FIG. 9 (F1) 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 in the usual manner after calculating the tax for the plurality of numerical values shown in FIGS. Turn on mode. The CPU 21 also calculates the tax rate 1 and tax rate 1 based on the tax-included 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 to 22f, respectively. The total amount including tax "3825" indicating the total amount including tax (525+3300) to which tax rate 2 is applied is calculated and stored in the tax total memory area 22g and displayed on the display unit 12 ( Figure 8 (A) bottom). to 3rd line, Figure 9 (C1)). Further, the CPU 21 displays "RCL" as the tax total recall mode symbol 12d in the status display area of the display unit 12 (FIG. 9(C1)). Here, when the tax calculation total key 11c is operated, as shown in FIG. 9 (C2), the CPU 21 calculates the total amount excluding tax, which is the sum of the total amount excluding tax to which tax rate 1 and tax rate 2 are respectively applied. 3500" is displayed. Furthermore, when the tax calculation total key 11c is operated, the CPU 21 calculates the total tax amount "325" which is the total of the total tax amount to which the tax rate 1 and the tax rate 2 are respectively applied, as shown in FIG. 9 (C3). Display. Furthermore, 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 pressed and held after calculating taxes for a plurality of numerical values shown in FIG. The total amount "700" is read out and displayed (first line from the bottom in FIG. 8(A), FIG. 9(F1)).

Next, a case of key operation shown in FIG. 8(B) will be explained. Note that the tax calculation shown in FIG. 8(B) is executed in the same manner as in FIG. 8(A) described above, and detailed description thereof will be omitted. In FIG. 8(B), after tax calculation for multiple numbers (200 [GST+1] 300 [GST+1] 1000 [GST+1] 2000 [GST+1]), normal calculation (100 [×] 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 in response to the operation on the tax calculation total key 11c (third line from the bottom of FIG. 8(B), 9 (F1)).

On the other hand, when the tax calculation total key 11c is pressed and held after calculating the tax for the plurality of numerical values shown in the 1st to 6th lines of FIG. 8(B), the CPU 21 turns on the tax total recall mode. Further, the CPU 21 calculates the tax rate 1 and tax rate 2 based on the tax-included 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 tax rate 2 total memory area 22d, respectively. The total tax-included amount "3825" indicating the total tax-included total amount (525+3300) is calculated and stored in the tax total memory area 22g, and displayed on the display unit 12 (FIG. 8(B) 1 from the bottom). row, FIG. 9(C1)). Further, the CPU 21 displays "RCL" as the tax total recall mode symbol 12d in the status display area of the display unit 12 (FIG. 9(C1)).

In this way, by operating (short press) the tax calculation total key 11c immediately after performing the normal calculation, or by long pressing the tax calculation total key 11c immediately after the tax calculation, the total total according to the normal calculation can be displayed. . In addition, as mentioned above, by operating (short press) 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 used depending on the previous operating state.

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

FIGS. 9(D1) to (D3) show display examples when the tax 1 calculation key 11b1 is operated. When the tax 1 calculation key 11b1 is operated while the displays shown in FIGS. 9(C1) to (C3) are displayed, the CPU 21 calculates the tax rate 1 based on the tax rate 1, as shown in FIG. 9(D1). The total amount including the first tax "525" will be displayed. Here, when the tax 1 calculation key 11b1 is operated, the CPU 21 displays the first total amount excluding tax "500" as shown in FIG. 9 (D2). Further, when the tax 1 calculation key 11b1 is operated, the CPU 21 displays the first tax total amount "25" as shown in FIG. 9 (D3). Furthermore, 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 total amount including tax "525".

Note that when the tax 2 calculation key 11b2 is operated in the display states 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 Further, when the tax calculation total key 11c is operated in the display states shown in FIGS. 9(D1) to (D3), the CPU 21 changes to the display state of the total amount including tax shown in FIG. 9(C1) described above. Transition.

FIGS. 9(E1) to (E3) show display examples when the tax 2 calculation key 11b2 is operated. When the tax 2 calculation key 11b2 is operated while the displays shown in FIGS. 9(C1) to (C3) are displayed, the CPU 21 calculates the tax rate 2 based on the tax rate 2, as shown in FIG. 9(E1). Display the second total amount including tax "3300". Here, when the tax 2 calculation key 11b2 is operated, the CPU 21 displays the second total amount excluding tax "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). Furthermore, 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".

Note that 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 states shown in FIGS. 9(E1) to (E3), the CPU 21 changes to the display state of the total amount including tax shown in FIG. 9(C1) described above. Transition.

In this way, while the tax total recall mode is in the ON state, the calculator 10 according to the present embodiment can calculate tax-included information at each of tax rate 1 and tax rate 2 by a simple operation using the tax 1 calculation key 11b1 and the tax 2 calculation key 11b2. You can switch between displaying the total amount, total amount excluding tax, and total amount including tax. Therefore, it is possible to easily check the total amount including tax, total amount excluding tax, and total amount including tax for each tax rate.

Further, while the tax total recall mode is in the on state, the calculator 10 in this embodiment displays the total total (FIG. 9 (C1 ) to (C3)), total display of tax rate 1 corresponding to tax 1 calculation key 11b1 (FIG. 9 (D1) to (D3)), 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 calculations and tax-exclusive calculations are executed in a mixed manner will be described. FIG. 10 shows specific key operations used in the following explanation, numerical values displayed on the display section 12, total tax-included amounts stored in the tax rate 1 total memory area 22c and tax rate 2 total memory area 22d, and the tax-excluded amount. Shows the total amount and total tax amount.

The key operations shown in FIGS. 8(A) and 8(B) described above are for executing only tax-inclusive calculations, but the key operations shown in FIG. 10 change the calculation mode to tax-excluding calculation mode in the middle of tax-inclusive calculations. An example of switching to and executing is shown below.

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

Thereafter, when the numerical value "200" is input as the tax-excluding amount for tax calculation (tax-inclusive calculation) and the tax 1 calculation key 11b1 ([GST+1 (TAX-1)]) is operated, the CPU 21 inputs the input value. In addition to storing the calculated value in the buffer memory area 22n, the tax-included amount "210" calculated by tax-inclusive calculation based on the tax-excluded amount and tax rate 1 and the tax-included amount calculated based on tax rate 1 are displayed. Display the symbol "GST+1" representing Further, the CPU 21 stores the result of the tax calculation using the tax rate 1 using the tax 1 calculation key 11b1 in the tax rate 1 total memory area 22c. In this case, as shown in FIG. 9, the total amount including tax for tax rate 1 "210", the total amount excluding tax for tax rate 1 "200", and the total tax amount for tax rate 1 "10" are stored in the tax rate 1 total memory area 22c. Ru.

Similarly, when the numerical value "300" is input as the tax-excluded amount for tax calculation and the tax 2 calculation key 11b2 is operated, the CPU 21 stores the input numerical value in the buffer memory area 22n, and The tax-included amount "330" calculated by tax-inclusive calculation based on the tax-excluded amount and tax rate 2, and the symbol "GST+2" indicating that the tax-included amount calculated based on tax rate 2 are displayed. Further, the CPU 21 stores the result of the tax calculation using the tax rate 2 using the tax 2 calculation key 11b2 in the tax rate 2 total memory area 22d. In this case, as shown in FIG. 10, the total amount including tax for tax rate 2 "330", the total amount excluding tax for tax rate 2 "300", and the total amount of tax for tax rate 2 "30" are stored in the tax rate 2 total memory area 22d. Ru.

Next, when the tax 2 calculation key 11b2 is operated while the tax-included total amount "330" for tax rate 2 is displayed, the CPU 21 calculates the value "300" as the tax-exclusive amount 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-]) is operated to change the calculation mode to the tax-excluding calculation mode. When the CPU 21 detects the operation of the tax calculation mode switching key 11d, the CPU 21 switches the calculation mode to the tax-excluding calculation mode. Further, the CPU 21 causes the display unit 12 to display [TAX-] indicating the tax-inclusive calculation mode as the tax calculation mode symbol 12b.

Thereafter, when the numerical value "660" is input as the tax-included amount for tax calculation (tax-excluding calculation) and the tax 2 calculation key 11b2 ([GST+2 (TAX-2)]) is operated, the CPU 21 The calculated value is stored in the buffer memory area 22n, and the tax-exclusive amount "600" calculated by tax-excluding calculation based on the tax-included amount and tax rate 2 and the tax-exclusive amount calculated based on tax rate 2 are displayed. Display the symbol "TAX-2" to indicate that In the tax-excluding calculation, as shown in FIG. 10, the result of the tax-excluding 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-]) is operated to change the calculation mode to the tax-inclusive calculation mode. When the CPU 21 detects the operation of the tax calculation mode switching key 11d, the CPU 21 switches the calculation mode to the tax-inclusive calculation mode.

Thereafter, when the tax 1 calculation key 11b1 ([GST+1)]) is operated for tax calculation (tax-inclusive calculation) while the numerical value "600" is displayed due to the tax-excluding calculation, the CPU 21 The tax-included amount "630" calculated by tax-inclusive calculation based on the numerical value and tax rate 1, and the symbol "GST+1" indicating that the tax-included amount calculated based on tax rate 1 are displayed. Further, the CPU 21 adds the results of the 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-included total amount of tax rate 1 "840", the tax-excluding total amount of tax rate 1 "800", and the tax total amount of tax rate 1 "30" are stored in the tax rate 1 total memory area 22c.

In this way, when calculating the tax-inclusive amount at tax rate 1 for the number "660" which indicates the tax-inclusive amount at tax rate 2, switch to the tax-excluding calculation mode in the middle of the tax-inclusive calculation and calculate the tax-exclusive amount of the number "660". You can perform tax-excluding calculations for The numerical value (input number) displayed on the display unit 12 as the calculation result of the tax-excluding calculation can be used as is for tax calculation. Further, in the tax-excluding calculation, the numerical values stored in the tax rate 1 total memory area 22c and the tax rate 2 total memory area 22d are not affected. Therefore, by switching the tax calculation mode to the tax-inclusive calculation mode again, selecting a different tax rate 1 for the displayed value, and executing the tax-inclusive calculation, the result of the tax-inclusive calculation using the tax rate 1 can be stored in the tax rate 1 total memory. It can be reflected in the area 22c.

Therefore, in markets like India that use multiple consumption tax rates, if you need to calculate tax using other tax rates based on the price of a product that is listed as tax-inclusive, you can switch to tax-excluding calculation mode. You can perform tax-excluding calculations to obtain the tax-excluded price, and then perform tax-inclusive calculations using other tax rates.

Next, a case where tax calculation and normal calculation are executed in a mixed manner will be explained. FIG. 11 shows specific key operations used in the following explanation, numerical values displayed on the display unit 12, total tax-included amount stored in each of the tax rate 1 total memory area 22c and the tax rate 2 total memory area 22d, and the tax-excluded amount. Shows the total amount and total tax amount. Here, an example will be described in which four arithmetic calculations are performed using numerical values (numbers) obtained by tax calculation. Note that the downward arrows in the third to eighth columns of FIG. does not change).

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

Next, when the numerical value "200" is input as the tax-exclusive amount 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 tax-exclusive amount 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 1 are displayed. Further, the CPU 21 stores the result of the tax calculation using the tax rate 1 using the tax 1 calculation key 11b1 in the tax rate 1 total memory area 22c. In this case, as shown in FIG. 11, the total amount including tax for tax rate 1 "210", the total amount excluding tax for tax rate 1 "200", and the total tax amount for tax rate 1 "10" are stored in the tax rate 1 total memory area 22c. Ru.

Similarly, when the numerical value "200" is input as the tax-excluded amount and the tax 1 calculation key 11b1 is operated, the CPU 21 stores the input numerical value in the buffer memory area 22n, and also calculates the tax-excluded amount and the tax rate 1. The tax-included amount "315" calculated by tax-inclusive calculation based on is displayed. Further, the CPU 21 adds the result of the tax calculation using the 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 total amount including tax for tax rate 1 "525", the total amount excluding tax for tax rate 1 "500", and the total tax amount for tax rate 1 "25" are stored in the tax rate 1 total memory area 22c. Ru.

Subsequently, when the numerical value "1000" is input as the tax-excluded 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 also calculates the tax-excluded amount and 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 2 are displayed. Further, the CPU 21 stores the result of the tax calculation using the tax rate 2 using the tax 2 calculation key 11b2 in the tax rate 2 total memory area 22d. In this case, as shown in FIG. 11, the tax-included total amount of tax rate 2 "1100", the tax-excluded total amount of tax rate 2 "1000", and the tax total amount of tax rate 2 "100" are stored in the tax rate 2 total memory area 22d. Ru.

Similarly, when the numerical value "2000" is input as the tax-excluded 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 also calculates the tax-excluded amount and the tax rate 2. Displays the tax-included amount "2200" calculated based on the tax-included calculation. Further, the CPU 21 adds the result of the tax calculation using the 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 total amount including tax for tax rate 2 "3300", the total amount excluding tax for tax rate 2 "3000", and the total amount of tax for tax rate 2 "300" are stored in the tax rate 2 total memory area 22d. Ru.

Here, it is assumed that the tax calculation total key 11c is pressed in a normal manner 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 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 outside of the table in FIG. 11 indicates that the corresponding line is being displayed and is in recall mode. Further, the downward arrow indicates that the recall mode continues from the sixth line to the second line from the bottom, that is, until immediately before the [AC] key is pressed.

When the tax total recall mode is turned on, the CPU 21 stores the tax-included total amount "3825", which is the sum of the tax-included total amount calculated by tax rate 1 and tax rate 2, in the tax total memory area 22g. , to be displayed on the display unit 12. Here, when the tax calculation total key 11c is repeatedly operated, the CPU 21 sequentially calculates the tax-excluded total amount "3500" and the tax total amount "325" according to the key operation, and stores it in the tax total memory. The data is stored in the area 22g, and read out and displayed on the display unit 12.

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

In this way, even if the arithmetic keys or numerical keys are operated for the four arithmetic calculations during tax calculation, the tax total recall mode remains 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 through tax calculations, also remain maintained.

Here, it is assumed that the tax calculation total key 11c is pressed in a normal manner 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. Therefore, the CPU 21 causes the display unit 12 to display the total amount including tax stored in the tax total memory area 22g in response to the operation on the tax calculation total key 11c. That is, when the tax total recall mode is set to the ON state, when an instruction to read the total amount including tax is input by operating the tax calculation total key 11c, the CPU 21 reads the numerical value "162" as a result of executing the four arithmetic calculations. .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 in order to display the total amount including tax calculated using tax rate 1. When the tax 1 calculation key 11b1 is operated, the CPU 21 displays the first tax rate 1 calculation key 11b1 stored in the tax rate 1 total memory area 22c instead of displaying the tax-inclusive 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 stores the tax-included total amount stored in the tax total memory area 22g in accordance with the operation on the tax calculation total key 11c in the same manner as described above. 3825'' is displayed on the display unit 12. In other words, when the tax total recall mode is set to the on state, not only the numerical values that are the results of the normal calculation based on the four arithmetic calculations are being displayed, but also the numerical values that are the results of the tax calculation are being displayed on the display unit 12. In this case, the total amount including tax can be displayed in response to the operation on the tax calculation total key 11c. That is, after the tax total recall mode is set to the on state, the total amount including tax 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 is operated in order to display the total amount including tax in tax calculation using tax rate 2. When the tax 2 calculation key 11b2 is operated, the CPU 21 displays 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" according to the operation of the tax 2 calculation key 11b2. The total amount including tax "3300" is read out and displayed on the display unit 12.

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

Although not shown, numerical values related to the results of tax calculation based on tax rates 0, 3, and 4 are stored in the tax rate 0 total memory area 22b, the tax rate 3 total memory area 22e, and the tax rate 4 total memory area 22f, respectively. Then, in response to the operation of the tax 0 calculation key 11b0, the tax 3 calculation key 11b3, or the tax 4 calculation key 11b4, the corresponding numerical values (total amount including tax) can be read out and displayed.

Furthermore, in the above explanation, 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, but in addition, both the tax-excluding total and the tax total, or Either one may be displayed.

Next, when the tax 2 calculation key 11b2 is repeatedly operated while the second total amount including tax "3300" is displayed, the CPU 21 calculates the total amount excluding tax "3000" and the total tax amount according to the key operation. The amount "300" is read out from the tax rate 2 total memory area 22d and displayed on the display section 12 one after another.

When the total tax amount “300” is displayed, when [÷], [2], and [=] are keyed in for the four arithmetic calculations, the CPU 21 calculates the value “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 numerical value "150" is added to the numerical value stored in the total memory area 22h. In addition to displaying the total amount of tax and executing the four arithmetic calculations, it is also possible to display the total amount including tax or the total amount excluding tax and executing the four arithmetic calculations.

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

In this way, the tax total recall mode remains on until the [AC] key is operated. When the tax total recall mode is in the on state, the numerical values stored in the tax rate-specific tax total memory areas 22b to 22f are displayed on the display section 12 by operating the tax calculation key 11b, and are used as targets for normal calculation. can do.

In this way, in the calculator 10 according to the present embodiment, the tax total recall mode is maintained in the on state even if normal calculation is performed while the tax total recall mode is on, so tax calculation and normal calculation are executed separately. The results of each calculation can be stored. Therefore, tax calculation and normal calculation can be easily executed together. In addition, the total amount calculated based on the tax calculation stored in the tax total memory area 22g (total amount including tax, total amount excluding tax, total tax amount), 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 section 12 in response to key operations and can be used for normal calculation. Therefore, it is possible to easily perform normal calculations that target the results (numbers) of tax calculations.

FIG. 12 is an example of a slip format used in a retail store in India, and shows an excerpt of the entry column for the total amount. The slip allows you to enter numerical values for five types of tax rates, starting from the top: total amount excluding tax by tax rate, State GST (SGST) by tax rate, Central GST (CGST) by tax rate, and total amount excluding tax by tax rate. There are fields to enter Inter-State GST (IGST), total amount including tax by tax rate, and total amount including tax. Values are entered in each column according to the tax calculation actually performed at the store.

The entry of numerical values into a slip will be explained with reference to the input operation example shown in FIG. 11. When the tax calculation total key 11c is operated immediately after tax calculation, the tax total recall mode is turned on and the total amount including tax "3825" is displayed on the display unit 12 (line 6 in FIG. 11). The filler looks at this 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 tax-included total amount "3300" is displayed on the display section 12 (line 14 in FIG. Transfer the numerical value to the amount column (column 3, row 5 in Figure 12). When the tax 2 calculation key 11b2 is operated again, the second total amount excluding tax "3000" is displayed on the display section 12 (line 15 in FIG. Transfer the numerical value to the amount column (third column, first row in Figure 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 section 12 (line 16 in FIG. 11), and then using the displayed numerical value, When half of the total tax amount for 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 filler transfers the numerical values to the SGST and CGST columns for tax rate 2 in the slip (column 3, row 2, row 3 in FIG. 12). In this example, it is assumed that there are no particular numerical values to be transferred to the IGST column. Although not illustrated in FIG. 10, by operating the tax 1 calculation key 11b1 while the tax total recall mode is on, the tax calculation result or tax calculation result can be displayed for tax rate 1 as well as for tax rate 2. The results of the targeted normal calculations can be displayed and the numerical values can be transferred to each column of the slip, as shown in the second column of FIG.

As described above, according to the calculator of this embodiment, after completing the tax calculation, the tax total recall mode is turned on, and then the calculated total tax amount is used to calculate SGST, CGST, or IGST can be calculated. Furthermore, once the tax total recall mode is turned on, the tax total recall mode remains on unless a specific operation ([AC] key operation) is performed, and the tax total memory areas 22b to 22f by tax rate and each numerical value stored in the tax total memory area 22g is held, so after tax calculation is completed, by operating the tax calculation total key 11c or the tax calculation key 11b, the total tax amount (tax-included amount/tax You can call up the tax amount (excluded amount/tax amount) or the total tax amount for multiple tax rates (tax included amount/tax excluded amount/tax amount) at any time and display it on the display section 12, and furthermore, you can use the displayed values to perform normal calculations. By executing this, the SGST, CGST, or IGST for the total tax amount or the total tax amount for multiple tax rates can be calculated at a desired timing. Therefore, according to the calculator of this embodiment, in particular, when the total tax amount or the total tax amount by tax rate is not directly posted to the slip, but the normal calculation based on each numerical value is performed and then posted to the slip. In addition, posting work to slips becomes easier.

Note that the methods described in the embodiments, that is, the processes shown in the flowcharts of FIGS. It can be stored and distributed in recording media such as flexible disks, hard disks, etc.), optical disks (CD-ROMs, DVDs, etc.), and semiconductor memories. Then, the computer reads the program recorded on the external recording medium and has its operations controlled by this program, thereby realizing the same processing as the functions described in the embodiments.

In addition, program data for realizing each method can be transmitted over a network (Internet) in the form of program code, and the program data can be transmitted from a computer (server device, etc.) connected to this network (Internet). It is also possible to implement functions similar to those of the embodiments described above.

Note that the present invention is not limited to the embodiments, and can be variously modified at the implementation stage without departing from the gist thereof. Further, 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 constituent features are deleted from all the constituent features shown in the embodiments or some constituent features are combined, the problem stated 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 can be obtained, a configuration in which this component is deleted or combined can be extracted as an invention.

Below, the invention described in the original claims of the present application will be added.

[1] In response to an input of an instruction to execute a first calculation, a first calculation using numerical values is executed, and a first numerical value related to the result of the executed first calculation is stored in a first memory, and a display unit display it on
In response to input of an execution instruction for a second calculation different from the first calculation, a second calculation using numerical values is executed, and a second numerical value related to the result of the executed second calculation is stored in a second memory. , and displayed on the display section,
If a first read instruction is input while a 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. display it on
If the first reading instruction is input while a numerical value indicating the result of the executed second calculation is being displayed on the display unit, the second numerical value stored in the second memory is displayed. A computer that has a control section that displays information on the computer.

[2] The control unit includes:
The calculator according to [1], wherein a read mode for displaying the first numerical value related to the result of the executed first calculation is set in response to input of a read mode setting instruction.

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

[4] The control unit includes:
In the state where the read mode is set,
In response to the input of the execution instruction for the second calculation, a second calculation using the numerical value displayed on the display unit is executed without canceling the set readout mode, and the executed second calculation is performed. The calculator according to [2] or [3], wherein a numerical value indicating the result is displayed on the display section.

[5] The control unit includes:
In the state where the read mode is set,
In response to input of a second read instruction, read out the first numerical value stored in the first memory and display it on the display unit;
In response to the input of the execution instruction for the second calculation, the second calculation is executed using the first numerical value displayed on the display unit without canceling the set readout mode. The calculator according to any one of [2] to [4], wherein a numerical value indicating the result of the second calculation is displayed on the display section.

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

[7] The control unit includes:
In the state where the read mode is set,
The computer according to any one of [2] to [6], wherein the set reading mode is canceled in response to input of a predetermined instruction.

[8] The control unit includes:
In the 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 section includes:
In the state where the read mode is set,
[2] to [2] causing the first numerical value stored in the first memory to be displayed on the display unit regardless of the display content on the display unit when the first read instruction is input; 8].

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

[11] The control unit includes:
When an instruction to execute the first calculation related to the first tax rate is input, the tax calculation based on the first tax rate is executed, and a third numerical value related to the result of the tax calculation based on the first tax rate is stored in the first memory. let me remember,
When an instruction to execute the first calculation related to the second tax rate is input, the tax calculation based on the second tax rate is executed, and a fourth numerical value related to the result of the tax calculation based on the second tax rate is stored in the first memory. let me remember,
[2] to [10], wherein the readout mode is set in response to input of the first readout instruction, and a total sum of the third numerical value and the fourth numerical value is displayed on the display unit. A calculator as described in any one item.

[12] The control unit includes:
If an instruction to execute the first calculation related to any one of the multiple 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 executed. storing numerical values related to the results in the first memory;
In the state where the read mode is set,
[2] to [11] displaying a tax total obtained by summing up numerical values indicating the result of tax calculation based on at least one of the above tax rates in response to an input of an instruction to execute a function related to any one of the tax rates; ] Calculator according to any one of the following.

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

[14] The control unit includes:
In response to input of a tax calculation mode switching instruction, switching the calculation to be executed as the first calculation to either a tax-inclusive calculation or a tax-exclusive calculation,
When performing the tax-inclusive calculation as the first calculation, storing the first numerical value in the first memory;
The calculator according to any one of [1] to [13], wherein when executing the tax-excluding calculation as the first calculation, the first numerical value is not stored in the first memory.

[15] By the computer of the calculator,
In response to the input of a first calculation execution instruction, a first calculation using numerical values is executed, a first numerical value related to the result of the executed first calculation is stored in a first memory, and is displayed on a display unit. ,
In response to input of an execution instruction for a second calculation different from the first calculation, a second calculation using numerical values is executed, and a second numerical value related to the result of the executed second calculation is stored in a second memory. , and displayed on the display section,
If a first read instruction is input while a 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. display it on
If the first reading instruction is input while a numerical value indicating the result of the executed second calculation is being displayed on the display unit, the second numerical value stored in the second memory is displayed. A program to display and function in the section.

[16] A calculation method executed by a control unit of a computer, comprising:
In response to the input of a first calculation execution instruction, a first calculation using numerical values is executed, a first numerical value related to the result of the executed first calculation is stored in a first memory, and is displayed on a display unit. ,
In response to input of an execution instruction for a second calculation different from the first calculation, a second calculation using numerical values is executed, and a second numerical value related to the result of the executed second calculation is stored in a second memory. , and displayed on the display section,
If a first read instruction is input while a 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. display it on
If the first reading instruction is input while a numerical value indicating the result of the executed second calculation is being displayed on the display unit, the second numerical value stored in the second memory is displayed. The calculation method to be displayed in the section.

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

Claims (6)

In response to an input of an instruction to execute a first calculation, a first calculation using numerical values is executed, and a numerical value indicating the result of the executed first calculation is displayed on a display unit, and the result of the first calculation is displayed on a display unit. storing a related first numerical value in a first memory ;
In response to an input of an execution instruction for a second calculation different from the first calculation, a second calculation using numerical values is executed, and a numerical value indicating the result of the executed second calculation is displayed on a display unit, and storing a second numerical value related to the result of the second calculation in a second memory ;
When the user performs an operation in the first mode on a predetermined operation key as an input of a first reading instruction while a numerical value indicating the result of the executed first calculation is being displayed on the display unit, If the user operates the predetermined operation key in a second mode as an input of a second reading instruction while displaying the first numerical value stored in one memory on the display unit, displaying the second numerical value stored in the second memory on the display unit;
When a user performs an operation on the predetermined operation key in the first mode as an input of the first reading instruction while a numerical value indicating the result of the executed second calculation is being displayed on the display unit; , while displaying the second numerical value stored in the second memory on the display unit, the user performs an operation on the predetermined operation key in the second mode as an input of the second reading instruction. if the first numerical value stored in the first memory is displayed on the display unit;
A computer with a control unit. The operation on the predetermined operation key in the first aspect is a short press operation on the predetermined operation key,
The operation on the predetermined operation key in the second aspect is a long press operation on the predetermined operation key,
A computer according to claim 1. The first calculation is a calculation that applies a preset tax rate,
The second calculation is a calculation to which the preset tax rate is not applied.
A computer according to claim 1 or claim 2 . The first numerical value related to the result of the first calculation includes a tax-included amount or a tax-exclusive amount, and a tax amount,
The computer according to claim 3 . A calculation method performed by a computer,
In response to an input of an instruction to execute a first calculation, a first calculation using numerical values is executed, and a numerical value indicating the result of the executed first calculation is displayed on a display unit, and the result of the first calculation is displayed on a display unit. storing a related first numerical value in a first memory;
In response to an input of an execution instruction for a second calculation different from the first calculation, a second calculation using numerical values is executed, and a numerical value indicating the result of the executed second calculation is displayed on a display unit, and storing a second numerical value related to the result of the second calculation in a second memory;
When the user performs an operation in the first mode on a predetermined operation key as an input of a first reading instruction while a numerical value indicating the result of the executed first calculation is being displayed on the display unit, If the user operates the predetermined operation key in a second mode as an input of a second reading instruction while displaying the first numerical value stored in one memory on the display unit, displaying the second numerical value stored in the second memory on the display unit;
When a user performs an operation on the predetermined operation key in the first mode as an input of the first reading instruction while a numerical value indicating the result of the executed second calculation is being displayed on the display unit; , while displaying the second numerical value stored in the second memory on the display unit, the user performs an operation on the predetermined operation key in the second mode as an input of the second reading instruction. if the first numerical value stored in the first memory is displayed on the display unit;
Calculation method including control processing. computer,
In response to an input of an instruction to execute a first calculation, a first calculation using numerical values is executed, and a numerical value indicating the result of the executed first calculation is displayed on a display unit, and the result of the first calculation is displayed on a display unit. storing a related first numerical value in a first memory;
In response to an input of an execution instruction for a second calculation different from the first calculation, a second calculation using numerical values is executed, and a numerical value indicating the result of the executed second calculation is displayed on a display unit, and storing a second numerical value related to the result of the second calculation in a second memory;
When the user performs an operation in the first mode on a predetermined operation key as an input of a first reading instruction while a numerical value indicating the result of the executed first calculation is being displayed on the display unit, If the user operates the predetermined operation key in a second mode as an input of a second reading instruction while displaying the first numerical value stored in one memory on the display unit, displaying the second numerical value stored in the second memory on the display unit;
When a user performs an operation on the predetermined operation key in the first mode as an input of the first reading instruction while a numerical value indicating the result of the executed second calculation is being displayed on the display unit; , while displaying the second numerical value stored in the second memory on the display unit, the user performs an operation on the predetermined operation key in the second mode as an input of the second reading instruction. if the first numerical value stored in the first memory is displayed on the display unit;
A program that functions as a control means.