JP2000112897A - Calculator and medium storing operation control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To convert an operation result in accordance with the currency unit of a money amount at the time of inputting an operational expression. SOLUTION: A rate storing area 13 in a memory 9 built in the calculator 1 stores an exchange rate to be the ratio of yen to dollar. An operator inputs an operational expression including a money amount as a term to the computer 1 by using a key input device 4, and when the money amount is expressed by yen, a '=' key in the device 4 is depressed. When the money amount is expressed by dollar, a '$' key is depressed. When the '=' key is depressed, a central processing unit(CPU) 3 executes the four rules of arithmetic operations of the inputted operational expression and divides the result of the four rules of arithmetic operations by the exchange rate. When the '$' key is depressed, the CPU 3 executes only the four rules of arithmetic operations of the operational expression. Furthermore, the CPU 3 rounds the division result or the arithmetic operation result at two decimal places and displays the rounded division result or arithmetic operation result on a display device 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a computer and an arithmetic control program for calculating four arithmetic operations in terms of a monetary value expressed in a plurality of types of money and calculating the total value of the arithmetic results of the four arithmetic operations. Regarding the stored medium.

[0002]

2. Description of the Related Art A conventional computer, for example, a so-called calculator has a conversion function for performing mutual conversion between currency and foreign currency. The calculator provided with the conversion function previously stores an exchange rate between a currency and a foreign currency. When causing the calculator having the conversion function to convert an amount represented by a currency into a foreign currency, the operator instructs execution of the conversion function provided in the calculator with the amount stored in the calculator. Key to operate. The calculator multiplies the stored amount by the exchange rate or divides the amount by the exchange rate in response to a key operation, and displays a multiplication or division result, that is, a conversion result.

[0003] For example, Japanese Patent Application Laid-Open No. H5-217074 discloses a POS device capable of mutually converting between foreign currency and Japanese yen. The POS device includes, in addition to a general configuration for inputting and calculating an amount, a foreign currency conversion program for performing the mutual conversion, a change calculation program for calculating a change amount, a foreign currency and a Japanese yen. And a foreign currency key for instructing the operation of the foreign currency conversion program. The POS device,
For example, if the foreign currency key is operated after the input and calculation of the amount of money expressed in Japanese yen, the foreign currency conversion program is executed. As a result, the calculation result of the calculation expressed in Japanese yen is converted into foreign currency. When the operator receives the deposit, the operator inputs the amount of the deposit into the POS device. After entering the deposit amount, the POS
The device executes the change calculation and foreign currency conversion program. As a result, the POS device indicates the amount of change to be paid in both foreign currency and Japanese yen and presents it to the operator.

Further, in the prior art computer, when the input of the arithmetic expression and the arithmetic operation are continuously performed a plurality of times, the arithmetic results are automatically added in order to obtain a total value of the arithmetic results of the multiple arithmetic operations. And a function of storing the addition result. In this case, the computer displays the stored addition result in response to the operator operating a key for instructing the display of the total value provided in the computer, for example, a so-called ground total (GT) key. .

[0005]

In recent years, a single store sometimes conducts transactions using currency and foreign currency. In such a store, for example, a certain product may be priced in yen and another product may be priced in dollars. When calculating the total value of these commodities using a computer of the prior art and a POS device disclosed in JP-A-5-217074, the computer and the POS device calculate the total amount of money represented by currency or foreign currency. After the calculation, the total value is converted into foreign currency or currency in response to the operation of the operator, so that it may take time to calculate the total value in monetary units desired by the operator. For this reason, it is not easy to obtain the sum of the amounts of goods represented by a plurality of types of money using the calculator and the POS device.

SUMMARY OF THE INVENTION An object of the present invention is to make it easy to understand the conversion procedure between a plurality of types of money in a computer, and to easily and without error calculating an arithmetic expression having an amount represented by each money as a term. An object of the present invention is to provide a computer and a medium storing an arithmetic control program.

[0007]

According to a first aspect of the present invention, there is provided an arithmetic expression input means for inputting an arithmetic expression of four arithmetic operations including, as a term, an amount represented by at least one of a plurality of predetermined types of money; Exchange rate storage means for storing an exchange rate between the plurality of types of money, calculation instruction means for instructing only the calculation of the arithmetic expression, calculation of the arithmetic expression, and the exchange rate of the calculation result of the calculation. Conversion instructing means for instructing the conversion, and in response to instructions from the calculation instructing means and the result display means capable of displaying the calculation result and the conversion result,
Calculating the arithmetic expression, and displaying the calculation result on the result display means, in response to an instruction from the conversion instruction means,
A calculating means for calculating the calculation formula, converting the calculation result using the value of the exchange rate, and displaying the conversion result on the result display means.

[0008] According to the first invention, the computer includes the above-mentioned two types of instruction means for calculating the arithmetic expression. As a result, when the operator designates one of the two types of instruction means, the arithmetic means uses the calculation result of the arithmetic expression as it is, or uses the exchange rate, in accordance with the instructed instruction means. After conversion, display. As a result, the calculator can simplify the operation of the operator for instructing the calculation of the arithmetic expression and the calculation and conversion as compared with the computer of the prior art.

According to a second aspect of the present invention, in the computer, the arithmetic means includes:
When the instruction from the calculation instruction unit is given, the calculation result is further rounded to a predetermined reference digit value and displayed, and when the instruction from the conversion instruction unit is given, the conversion result is further converted to the reference digit value. It is characterized by being rounded to a value and displayed.

According to a second aspect, the computer comprises:
In the computer according to the invention, the arithmetic means operates as described above. As a result, the calculator according to the second aspect of the invention always displays the calculation result and the conversion result rounded to the value of the reference number of digits. Therefore, the calculator can display the calculation and conversion results in a manner that is easy for the operator to see.

According to a third aspect of the present invention, there is provided a computer, comprising: a total value storage means capable of storing a total value of a plurality of calculation results and conversion results in the arithmetic means; and a total value display instructing means for instructing display of the total value. Further comprising: each time the calculation result or the conversion result is displayed on the result display means, the calculation means adds the calculation result or the conversion result to the total value in the total value storage means; and Is stored in the total value storage means, and when an instruction is given from the total value display instruction means, the addition result stored in the total value display means at the time when the instruction is given is displayed on the result display means. It is characterized by making it.

According to a third aspect, the computer comprises:
In addition to the computer of the invention, the above-mentioned means for calculating a plurality of arithmetic expressions or calculating the total value of the conversion results is further included, and the arithmetic means is configured to operate as described above. As a result, the computer according to the third aspect of the present invention can further simplify the operation of the operator for calculating the plurality of arithmetic expressions or calculating the total value of the conversion results.

[0013] In a computer according to a fourth aspect of the present invention, the calculating means includes:
When an instruction from the total value display instruction means is given,
The addition result is rounded to a predetermined reference digit value and displayed.

According to a fourth aspect, the computer is a third computer.
In the computer according to the invention, the arithmetic means operates as described above. As a result, the computer according to the fourth aspect of the invention always displays the total value rounded to the value of the reference digit. Therefore, the calculator can display the total value in a manner that is easy for the operator to see.

According to a fifth aspect of the present invention, the reference digit is two digits after the decimal point.

According to a fifth aspect, the computer is a second computer.
Alternatively, in the computer according to a fourth aspect, the reference digits are as described above. As a result, the calculator can display the calculation and conversion results and the total value up to the unit of the auxiliary currency which is 1/100 of the plurality of types of money units. The calculator can add the calculation and conversion results up to the unit of the auxiliary currency.

According to a sixth aspect of the present invention, the computer further includes an exchange rate input means for inputting the exchange rate and storing the exchange rate in the exchange rate storage means.

According to a sixth aspect, the computer comprises:
The computer according to the present invention is configured to further include the above-described means for setting an exchange rate. As a result, in the calculator according to the sixth aspect, the operator can easily set the exchange rate. Further, the computer can easily correct the stored exchange rate when the exchange rate fluctuates.

According to a seventh aspect of the present invention, there is stored an arithmetic control program for controlling an arithmetic expression of an arithmetic expression of four arithmetic operations including, as a term, an amount of money represented by at least one of a plurality of predetermined types of money. A medium,
A first operation for storing an exchange rate between the plurality of types of money and instructing only the calculation of the arithmetic expression; and an exchange rate of the calculation of the arithmetic expression and the calculation result of the calculation. Second to indicate conversion using
And an operation means capable of performing the operation, and a result display means capable of displaying an operation result of the operation expression, wherein the operation control program causes the computer to respond to the first operation,
Calculating the arithmetic expression, displaying the calculation result on the result display means, calculating the arithmetic expression in response to the second operation, converting the calculation result using the value of the exchange rate And a calculation control program for displaying a conversion result on the result display means.

According to a seventh aspect, the medium stores the above-described arithmetic control program. When the arithmetic control program is installed and executed on a computer, the computer operates in the same manner as the computer of the first invention. As a result, the computer of the first invention can be easily realized by the computer. That is, when the calculation control program causes the computer to calculate the calculation formula or convert the result of the calculation, the operation of the operator for instructing calculation or conversion can be simplified.

[0021]

FIG. 1 is a block diagram showing an electric configuration of a computer 1 according to an embodiment of the present invention. FIG. 2 is a front view of the computer 1. 1 and 2 will be described together. Calculator 1 performs a calculation of an arithmetic expression including a monetary amount represented by one of two types of money as a term, and a mutual conversion between the two types of money.

The computer 1 includes a central processing unit 3, a key input device 4, a key interface circuit 5, a display device 6, a display interface circuit 7, and two memories 8, 9. The key input device 4 is connected to the central processing unit 3 via the key interface circuit 5. Display device 6
Is connected to the central processing unit 3 via the display interface circuit 7. The key and display interface circuits 5 and 7 are circuits for matching the standards of signals transmitted and received between the key input devices and display devices 4 and 6 and the central processing unit 3. The two memories 8 and 9 are connected to the central processing unit 3 respectively. Key input device 4
Includes a plurality of keys 21 to 28 that can be operated by an operator. All keys 21 to 28 of the key input device 4 and the display surface 16 of the display device 6 are exposed on one surface of the computer 1.

One of the two memories 8, 9
Is a memory from which data can be read at least,
For example, it is realized by a read-only memory (ROM).
The other memory 9 of the two memories 8 and 9 is a memory from which data can be read and from which data can be written, and is realized by, for example, a random access memory. On the other hand, the memory 8
A program necessary for various processes in the central processing unit 3 is stored. The various processes include four arithmetic operations of the arithmetic expression and mutual conversion between the money. On the other hand, the memory 9 temporarily stores data necessary for the various processes. On the other hand, the memory 9 specifically includes a plurality of storage areas 11 to 14 in the memory space of the memory 9. Among the plurality of storage areas 11 to 14, the result storage area 11 stores the operation result Ans of the operation expression, and the total storage area 12
Stores the total value GT of the calculation results of the plurality of calculation expressions, and stores the exchange rate Ra between the two kinds of money in the rate storage area 13.
te, and the flag storage area 14 stores the exchange rate Ra
A mode flag RateF indicating a mode for confirming and changing te is stored.

When the numeric key group 21 among the plurality of keys 21 to 28 of the key input device 4 is operated, a numerical value is input. Since the numeric key group 21 includes keys for inputting numbers “0” to “9” and keys for inputting a decimal point “.”, Numerical values including digits after the decimal point can be input. The numerical value is a term of an exchange rate or an arithmetic expression described later. When the operation symbol key group 22 is operated,
Operation symbols of the four arithmetic operations, that is, "+", "-",
“×” and “÷” are input. "=" Key 23
Is operated, the four arithmetic operations of the arithmetic expression input prior to the operation of the key 23 and the conversion using the exchange rate of the arithmetic result of the four arithmetic operations are instructed. "＄" key 24
Is operated, only the four arithmetic operations of the arithmetic expression input prior to the operation of the key 24 are instructed.

A plurality of keys 21 to 2 of the key input device 4
If the total key 25 is operated, the display of the total value GT stored in the total storage area 12 is instructed. If the rate key 26 is operated only once, the exchange rate Ra currently stored in the rate storage area 13
When the display of te is instructed and the rate key 26 is operated twice consecutively, the change of the exchange rate Rate is instructed. When the clear key 27 is operated, initialization of the storage contents of the result storage area 11, the total storage area 12, and the flag storage area 14 is instructed. As a result, the stored contents in the three areas 11, 12, and 14 are erased,
The state is returned to a predetermined initial state. Each part 3 in the computer 1
If the power key 28 is operated in a state in which the power supply to the power supply to the power supply to the power supply to the power supply to the components 8 to 8 is stopped, the power supply to the respective components is started, and the result storage area 11, the total storage area 12, and the flag storage area 14 are initialized. Is indicated.

FIG. 3 is a flowchart for explaining the arithmetic processing of the central processing unit 3 when the "=" and "@" keys 23 and 24 are operated in the computer 1, respectively. Before the “=” and “＄” keys 23 and 24 are operated, the operator operates the numeric key group 21 and the arithmetic symbol key group 22 to input an arithmetic expression. In the present embodiment, it is assumed that the two kinds of money, ie, currency and foreign currency, are yen and dollar, and the exchange rate is a ratio of yen to one dollar. That is, in the present embodiment, for example, when 1 ＄ = 123.45 yen, the exchange rate Rate is “123.45”.

The operator operates the “=” key 23 when the monetary unit of the amount input as the term of the arithmetic expression is a yen, and presses the “＄” key 24 when the monetary unit is a dollar. Manipulate. The operation result of the key input device 4 is given to the central processing unit 3 via the key interface circuit 5 as a so-called interrupt. The central processing unit 3 determines which key has been operated in response to the operation result from the key input device 4. When it is determined that the “=” key 23 has been operated, the process proceeds from step A1 to step A2.
If it is determined that the “＄” key 24 has been operated, the process proceeds from step A4 to step A5.

The central processing unit 3 determines in step A2 that
The four arithmetic operations of the arithmetic expression are performed, and the calculation result of the arithmetic expression obtained as a result is set as an arithmetic result Ans, and the other memory 9
Is stored in the storage area 11. At the time of step A2, the operation result Ans in the result storage area 11 is the same as the monetary unit of the amount of money, which is the term of the operation expression, out of the two monetary units, ie, “yen” and “dollar”, that is, “ Circle ". After the storage, the central processing unit 3 calculates the operation result Ans in the result storage area 11 in step A3.
Is updated by dividing by the value of the exchange rate Rate in the rate storage area 13. As a result, the division result obtained by dividing the calculation result of the above equation by the exchange rate Rate is the calculation result An
s is stored in the result storage area 11. Step A
At time point 3, the operation result Ans in the result storage area 11
Is expressed in a monetary unit different from the monetary unit of the amount of money, which is a term of the operation formula, of two monetary units, that is, “dollar”.

Further, the central processing unit 3 executes step A5.
Then, the four arithmetic operations of the operation expression are performed, and the calculation result of the operation expression obtained as a result is stored in the result storage area 11 of the other memory 9 as the operation result Ans. At the time of step A5, the operation result Ans in the result storage area 11 is 2
Of the two monetary units, the monetary unit is the same as the monetary unit of the amount of money, which is a term of the operation formula, that is, represented by “dollar”. After updating the operation result Ans in step A3 and storing the operation result Ans in step A5,
The process proceeds from step A5 to step A6. As a result, in the processing of steps A6 to A8, the calculation result Ans is represented by “dollar” regardless of the monetary unit of the amount at the time of inputting the calculation formula.

The central processing unit 3 determines in step A6
The calculation result Ans in the result storage area 11 is rounded to a numerical value up to a predetermined reference digit and updated. In the present embodiment, the reference digit is two digits after the decimal point. Further, in the present embodiment, the central processing unit 3 specifically rounds off the portion of the calculation result Ans that is less than the second decimal place. Further, the rounding of the calculation result Ans is not limited to rounding, and another method, for example, rounding up or down may be used. After the update, the central processing unit 3 proceeds to step A7
Then, the calculation result Ans after the rounding is displayed on the display device 6 to two decimal places. After the display, the central processing unit 3 determines in step A8 that the total value G in the total storage area 12
The calculation result Ans after rounding is added to T and updated.
After the update, in step A9, the processing operation of the flowchart ends.

As described above, in the arithmetic processing using the computer 1 of the present embodiment, the operator operates the “=” key 23 or the “＄” key in accordance with the monetary unit of the amount of money input as the term of the arithmetic expression. Select 24 and operate. As a result, the calculator 1 obtains the calculation result A regardless of the monetary unit of the amount at the time of input.
The monetary unit representing ns can be easily unified to any one of the predetermined two types of monetary units, and the monetary unit of the amount at the time of input is one of the two types of monetary units. When either one is the other, the conversion of the operation result of the operation expression can be performed without error. Further, in the arithmetic processing, the operator only needs to use the two keys 23 and 24 according to the monetary unit of the amount of money at the time of input.
Thereby, the operation of the calculator 1 according to the monetary unit of the amount at the time of the input is simplified as compared with the computer of the prior art.

In the calculation process shown in FIG.
Is operated, and the calculation result Ans of the arithmetic expression, that is, the storage content of the result storage area 11 at the time of step A2 is
It is assumed to be "246 yen". In this case, for example, if the exchange rate is 123.45 yen per dollar, the calculation result Ans after conversion of the calculation formula, that is, the storage content of the result storage area 11 at the time of step A3 is “1.992709”.
599 ". The stored contents are rounded to a numerical value up to two digits after the decimal point in step A6. As a result, the final operation result of the operation expression is “$ 1.99”, and the final operation result “1,99” is displayed on the display surface 16 of the display device 6 as shown in FIG. Is done.

In the calculation processing of FIG. 3, it is assumed that the "@" key 24 is operated and the calculation result Ans of the calculation expression, that is, the storage content of the result storage area 11 at the time of step A5 is "$ 246". I do. In this case, Calculator 1
The calculation result of the above calculation expression is rounded to a value up to two digits after the decimal point without conversion, and then displayed. As a result, the final operation result of the operation expression is “$ 246”, and as shown in FIG.
6.00 ”is displayed on the display surface 16 of the display device 6.

As described above, the computer 1 displays the calculation result Ans of the calculation expression after rounding it, so that the displayed calculation result is smaller than the case where the calculation result Ans of the converted calculation expression is displayed as it is. Easy to read. Thereby, the computer 1 can prevent the operator from misreading the calculation result.

The operation result Ans of the final operation expression, that is, the digit after the decimal point of the operation result Ans after rounding is as follows:
It corresponds to the value of the auxiliary money of the predetermined money. Calculator 1 does not omit the notation of 0 when the decimal place of the calculation result Ans is 0. This is for the following reason. Prior art calculators may label, for example, 10 pounds and 5 pence (£ 10.5) as “10.5”. In this case, the operator of the computer changes “10.5” to 10
May be misinterpreted as £ 50p. In the computer 1 according to the present embodiment, 10 pounds and 50 pence are “10.50”.
And 10 lbs. And 5 pence are labeled "10.05". As a result, the operator is prevented from confusing the two, and the misreading of the calculation result Ans is prevented.

The reason why the reference digit is set to two digits after the decimal point in the present embodiment is as follows.
Dollars are widely used around the world, and the ratio between dollars and cents is 1: 100, and the ratio between yen and money is also 1: 100. Therefore, if the calculation result is rounded to two decimal places, the final calculation result can be represented by a combination of dollars and cents and a combination of yen and money. The reference digit is determined according to a ratio between the currency used in the calculator 1 and the auxiliary currency of the currency.
The number of digits may be other than two digits after the decimal point.

In the computer 1, when the operator operates the total key 25, the central processing unit 3 reads the total value GT stored in the total storage area 12, and stores the total value GT in two digits after the decimal point. Are displayed on the display device 6. The display state of the total value GT is the same as that described with reference to FIGS. As described above, in the calculator 1, the monetary unit of the final calculation result is unified to one of the predetermined two monetary units regardless of the monetary unit of the amount at the time of input. . Central processing unit 3
Calculates the total value GT by sequentially adding the final operation results.
Is calculated. Therefore, if the calculation process of FIG. 3 is repeated a plurality of times, the calculator 1 can obtain the total value GT expressed in any one of the above-mentioned money units, regardless of the money unit of the amount at the time of each input. . Therefore, Calculator 1
For example, the total price of a product priced in yen and a product priced in dollars can be easily calculated.

When the total key 25 and the “＄” key 24 are operated successively, the computer 1 converts the total value GT in the total storage area 12 into a yen in order to convert the total value GT into a yen. The result may be divided by Rate, and the resulting converted total value may be displayed on the display device 6. At this time, it is preferable that the calculator 1 displays the converted total value rounded to two decimal places.

FIG. 6 shows a computer 1 that has a rate key 2
6 is a flowchart for explaining an exchange rate setting process of the central processing unit 3 when the user operates the CPU 6; The value of the rate flag RateF is reset to 0 when the power supply to the respective units 3 to 8 of the computer 1 is started and when the erase key 27 is operated, respectively. Is maintained at 0 until the time when the operation is performed.

When the operator wants to check the value of the currently set exchange rate after the above two points,
The rate key 26 is operated only once. The operation result of the key input device 4 is given to the central processing unit 3 via the key interface circuit 5. The central processing unit 3 determines which key has been operated in response to the operation result from the key input device 4. If it is determined that the rate key 26 has been operated, the process proceeds from step B1 to step B2.

The central processing unit 3 determines in step B2
It is determined whether or not the current value of the rate flag RateF is 1. If the rate key 26 is operated only once after the above two time points, the rate flag RateF
Is kept at 0. In this case, the process proceeds from step B2 to step B3, and the central processing unit 3 sets 1 to the rate flag RateF. After setting the flag, the central processing unit 3 displays the value of the exchange rate currently stored in the rate storage area 13 in the display device 1 in step B4.
6 is displayed. As a result, the operator can confirm the value of the current exchange rate. After displaying the exchange rate, the central processing unit 3 determines in step B5 that the key input device 4
Wait for the key to be operated. When the key of the key input device 4 is operated, the steps B5 to B10
Then, the processing operation of the flowchart ends.

If the rate key 26 is operated again during the key input waiting state in step B5, the process proceeds from step B1 to step B2 again. In this case, since the rate flag RateF is set to 1, step B
From 2 go to step B6. In step B6, the central processing unit 3 determines whether or not a numerical value to be set as a new exchange rate is input after the rate key 26 is operated again. If a numerical value has been input, the process proceeds from step B6 to step B7, where the central processing unit 3 updates the rate storage area 13 by substituting the input numerical value. After the update, the process proceeds from step B7 to step B8. If the numerical value has not been input, the process proceeds from step B6 to step B8. The central processing unit 3 resets the rate flag RateF to 0 in step B8,
At step B9, the displayed exchange rate is displayed on display surface 1
Delete from 6. After the display is erased, the process proceeds from step B9 to step b10, and the processing operation of the flowchart ends.

As a result of the above processing, the numerical value input after the rate key is operated twice consecutively is stored in the rate storage area 13 as a new exchange rate. As described above, it is extremely easy to confirm and change the exchange rate in the computer 1. Therefore, the operator can adjust the rate storage area 1 according to the fluctuation of the exchange rate between yen and dollar, for example.
The exchange rate Rate in 3 can be easily changed.

As described above, the computer 1 of the present embodiment is
When calculating an arithmetic expression, the operator sets the “=” and “＄” keys 23 and 2 depending on whether the amount included as a term in the arithmetic expression is represented by “yen” or “dollar”.
In response to the use of No. 4, it is determined whether or not to convert the calculation result of the calculation formula using the exchange rate Rate. This result calculator 1 can represent the final calculation result using dollars, regardless of whether the monetary unit of the amount at the time of inputting the calculation formula is “yen” or “dollar”.

Calculator 1 also calculates the final operation result as
You may represent using a "circle". In this case, in the arithmetic processing of FIG. 3, except for the conversion processing of step A3, the computer 1 performs step A2 between step A2 and step A6.
A step of performing a conversion process of multiplying and updating the calculation result Ans obtained in step 5 by the exchange rate Rate is added.
Accordingly, when the monetary unit of the amount of money at the time of inputting the arithmetic expression is “yen”, that is, when the “=” key 23 is operated, the calculator 1 outputs the result of the four arithmetic operations of the arithmetic expression as it is, and Is "dollar", that is, "＄"
When the key 24 is operated, a conversion result obtained by converting the result of the four arithmetic operations of the arithmetic expression using the exchange rate Rate is output. The monetary unit of the operation result Ans of the operation expression output in this manner is “yen”, and the display state is the same as that shown in FIGS. 4 and 5. Conventionally, in practice, the method of marking yen and money is the same as the method of marking dollars and cents shown in FIGS. 4 and 5, since the value of money is indicated by two decimal places of the yen value. , Calculation result A in the above display state
When ns is expressed, there is no strange feeling.

Furthermore, in the calculator 1, the number of money units in the amount of money at the time of inputting the arithmetic expression is not limited to two, but may be three or more. In this case, the calculator 1 is provided with the same number of instruction keys as the number of types of money that can be used as a monetary unit of the amount of money at the time of inputting the arithmetic expression, and any one of the plurality of usable moneys and the plurality of usable keys. The exchange rate with each of the moneys is stored, and the operator selects and operates any one of the plurality of instruction keys according to the monetary unit of the amount at the time of inputting the arithmetic expression. Is done. Further, in this case, the computer 1 determines whether or not to convert the result of the four arithmetic operations of the arithmetic expression in response to the operated instruction key, and when performing the conversion, performs the conversion in accordance with the operated instruction key. Select the exchange rate to use. Regardless of which of the three or more types of money units the monetary unit of the amount at the time of inputting the arithmetic expression is, the result calculator 1 determines the final calculation result as one of the three or more types of money units. It can be represented using any one of the predetermined values.

That is, for example, when the calculator 1 can use the euro in addition to the yen and the dollar as the monetary unit of the amount at the time of inputting the arithmetic expression, the calculator 1 uses “=” and “＄”.
An "E" key is further provided in addition to the keys 23 and 24, and an exchange rate for euro conversion, which is a ratio of euro to dollar, is further stored. The operator operates the “=” key 23 when the monetary unit at the time of input is a yen, and operates the “＄” key 24 when the monetary unit is a dollar, and the monetary unit is euro. In this case, operate the "E" key.
When the “E” key is operated, the central processing unit 3
After the four arithmetic operations of the arithmetic expression, the result of the four arithmetic operations is converted using the exchange rate for euro conversion, and the converted operation result is output. Regardless of which of the three or more types of money units the monetary unit of the amount at the time of inputting the arithmetic expression is, the result calculator 1 determines the final calculation result as one of the three or more types of money units. It can be expressed using any one of them.

Calculator 1 may convert total value GT in total storage area 12 into a monetary unit corresponding to a key operated at the time of instructing the display of the total value, and display the same. For example, when only the total key 25 is operated, or when the total key 25 and the “=” key 23 are continuously operated,
In order to convert the total value GT into a yen, the total value GT is converted into a yen-to-dollar exchange rate Ra for yen conversion.
The result is divided by te, and the converted total value obtained as a result is displayed on the display device 6. When the total key 25 and the "$" key 24 are continuously operated, the total value GT expressed in dollars is output as it is. Further, for example, when the total key 25 and the “E” key are operated in succession, in order to convert the total value GT into euro, the total value GT is divided by the exchange rate for converting into euro,
The converted total value obtained as a result is output. As described above, the calculator 1 can represent the total value GT by using three or more types of money units. At this time, Calculator 1
Is preferably displayed by rounding the converted total value to two decimal places.

In the calculator 1, the combination of a plurality of monetary units used for displaying the amount of money at the time of input at the time of calculation is not limited to yen and dollar, or yen, dollar and euro, but may be other combinations. Combinations of currency and auxiliary currency of the currency that may be included in the other combinations include, for example, pounds and pences, francs and centimes, marks and penic, euros and eurocents, yuan and horns or minutes, wons and cheongs It is. Furthermore, the above-mentioned combinations are not limited to currency and foreign currency, but other combinations, for example, 2
Any kind of foreign currency may be used.

The computer 1 of this embodiment is an example of the computer of the present invention, and can be implemented in other various forms as long as the main operations are the same. In particular, the detailed operation of the components inside the computer 1 is not limited to this and may be realized by another operation as long as the same processing result is obtained. Calculator 1 of the present embodiment may be realized by a computer. For this purpose, software including a program and data for causing the central processing unit of the computer to perform the processing described in FIGS. 3 to 6 is stored in a storage medium readable by the computer. Examples of the medium include a CD-ROM and a floppy disk. To operate the computer as the computer 1, the medium is mounted on the computer, the software in the medium is installed on the computer, and the program in the installed software is processed by the central processing. Let the device run. Thereby, the entire computer operates as the computer 1. Thus, the computer according to the present embodiment can be easily realized using a general-purpose computer.

[0051]

As described above, according to the first aspect of the invention, the computer determines which one of two predetermined instruction means has given the instruction when performing the operation of the operation expression. Accordingly, the calculation result of the arithmetic expression is displayed as it is or after being converted using the exchange rate.
As a result, the calculator can simplify the operation of the operator for instructing the calculation of the arithmetic expression or the calculation and the conversion, as compared with the conventional computer. According to the second aspect, the calculator displays the calculation result or the conversion result rounded to a predetermined reference digit value. Therefore, the calculator can display the calculation and conversion results in a manner that is easy for the operator to see.

Further, according to the third invention, the computer calculates the total value of the calculation and the conversion result in parallel with the display of the calculation or conversion result of each of the plurality of arithmetic expressions. As a result, the calculator can further simplify the operation of the operator for calculating the total value. According to a fourth aspect, the computer calculates the total value by:
The value is always rounded to the value of the reference digit. Therefore, the calculator can display the total value in a manner that is easy for the operator to see.

Further, according to the fifth invention, the reference digit is two digits after the decimal point. As a result, the calculator:
The calculation and conversion result and the total value can be displayed up to one hundredth of a supplementary currency unit of the plurality of types of money. According to the sixth aspect, the computer includes means for setting an exchange rate to be used at the time of conversion by an operator. As a result, the calculator can easily set the exchange rate by the operator.
Still further, according to the seventh aspect, the medium stores an arithmetic control program for controlling whether to perform conversion using the exchange rate of the result of the four arithmetic operations of the arithmetic expression according to the operation result of the operating means. I do. When the computer executes the arithmetic control program, the operation of the operator for instructing calculation or conversion can be simplified.

[Brief description of the drawings]

FIG. 1 is a diagram showing an electrical configuration of a computer 1 according to an embodiment of the present invention.

FIG. 2 is a front view of the computer 1.

FIG. 3 is a flowchart for explaining a calculation process of a calculation formula in the computer 1;

FIG. 4 is a diagram showing a display state of a conversion result of a calculation result of a calculation formula in the calculator 1.

FIG. 5 is a diagram illustrating a display state of a result of four arithmetic operations of an arithmetic expression in the computer 1.

FIG. 6 is a flowchart illustrating a process of setting an exchange rate in the computer 1.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Computer 3 Central processing unit 4 Key input device 6 Display device 8, 9 Memory 12 Total storage area 13 Rate storage area 23 "=" key 24 "２５" key 25 Total key 26 Rate key

Claims (7)

[Claims] An arithmetic expression input means for inputting an arithmetic expression of four arithmetic operations including, as a term, an amount of money represented by at least one of a plurality of predetermined types of money, and an exchange rate between the plurality of types of money. Exchange rate storage means for storing the calculation formula; calculation instruction means for instructing only the calculation of the arithmetic expression; and conversion instructing means for instructing the calculation of the arithmetic expression and the conversion using the exchange rate of the calculation result of the calculation. Responding to an instruction from the result display means and the calculation instruction means capable of displaying the calculation result and the conversion result, calculating the arithmetic expression, and displaying the calculation result on the result display means, And calculating means for calculating the operation formula in response to an instruction from the computer, converting the calculation result using the value of the exchange rate, and displaying the conversion result on the result display means. When That computer. 2. When the calculation means receives an instruction from the calculation instruction means, further rounds and displays the calculation result to a predetermined reference digit value, and receives an instruction from the conversion instruction means. 2. The computer according to claim 1, wherein the conversion result is further rounded to the value of the reference digit and displayed. 3. The method according to claim 1, further comprising: a total value storage unit capable of storing a total value of a plurality of calculation results and conversion results in the arithmetic unit; and a total value display instruction unit instructing display of the total value. The means adds the calculation result or the conversion result to the total value in the total value storage means each time the calculation result or the conversion result is displayed on the result display means, and stores the addition result in the total value storage means. When an instruction is given from the total value display instruction means, the addition result stored in the total value display means at the time when the instruction is given is displayed on the result display means. The computer according to claim 1. 4. The computer according to claim 3, wherein said calculation means, when given an instruction from said total value display instruction means, rounds and displays said addition result to a predetermined reference digit value. . 5. The computer according to claim 2, wherein the reference digit is two digits after the decimal point. 6. The computer according to claim 1, further comprising an exchange rate input means for inputting said exchange rate and storing said exchange rate in said exchange rate storage means. 7. A medium for storing an operation control program for controlling an operation in a computer of an arithmetic expression of four arithmetic operations including, as a term, an amount of money represented by at least one of a plurality of types of predetermined money. A first operation for storing an exchange rate between the plurality of types of money, and instructing only the calculation of the arithmetic expression, and performing an exchange of the calculation of the arithmetic expression and a calculation result of the calculation. Second to indicate conversion using rate
And operation result display means capable of displaying the operation result of the operation expression. The operation control program causes the computer to display the operation expression in response to the first operation. Calculating, displaying the calculation result on the result display means, calculating the arithmetic expression in response to the second operation, converting the calculation result using the value of the exchange rate, and calculating the conversion result. A medium for storing an arithmetic control program, wherein the medium is displayed on the result display means.