JP2003150563A - Calculator and calculation processing program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a calculator capable of successively displaying or redisplaying a halfway expression by an easily understandable operation without requiring a special halfway result memory, and without making a complicated halfway result calculation. SOLUTION: '10×2+4×3' is taken out by processing in S1402. After executing processing of S1403 and S1404 in this taken-out expression part, a result of a calculation part is inputted to an original expression part (S1405), and next, '=' is added to a numeric expression memory, and this expression part is inputted (stored) (S1406). By processing in this S1406, the numeric expression memory becomes a state of storing a series of expression '(5+5)×2+(2+2)×3=10×2+4×3=20+12' by adding an '='-added expression part '20+12' to '(5+5)×2+(2+2)×3=10×2+4×3'. A halfway expression is displayed in S1409, and thus, '=20+12' is displayed on a display part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a computer and a calculation processing program having a function of displaying an intermediate formula which is a formula at an intermediate stage according to a predetermined procedure.

[0002]

2. Description of the Related Art Conventionally, various proposals have been made regarding a display function of an intermediate type in a calculator (electronic desk calculator) or the like. For example, when fractions are reduced, there are fractional calculators that are displayed while reducing numbers in order, and those that display calculation formulas at intermediate stages (hereinafter referred to as intermediate formulas) in order of format priority. . There is also proposed a method that can redisplay the intermediate formula.

In these conventional proposals, in order to display or redisplay the intermediate formula, the intermediate formula is calculated each time, or a special intermediate formula area is provided and the intermediate formula is stored in this area, and if necessary, it is stored. The intermediate formula is read out.

[0004]

However, in the method (1), each time an intermediate expression is displayed, it is necessary to re-execute the calculation from the first expression or perform the calculation in the reverse direction from the final result. For this reason, the calculation process becomes complicated due to a plurality of calculations and calculation in the reverse direction from the final result, and it takes time to display.

Further, in the method (1), it is necessary to separately prepare a memory area for storing all the intermediate expressions. However, the calculator has a limited memory area, and even when the intermediate display function is added to the conventional model, the calculator is naturally limited in terms of memory. For example, the formula input area is 10
When adding this function to a calculator with 0 characters, half of the formula has to be used as an intermediate formula area in order to display an intermediate formula, and the mathematical expression input area becomes half, causing the calculator to malfunction and the product value to decline. Will result.

The present invention has been made in view of such a conventional problem, and does not require a special intermediate result memory, does not perform complicated intermediate result calculation, and sequentially displays intermediate formulas by an easy-to-understand operation. Or to provide a computer that can be re-displayed.

[0007]

In order to solve the above-mentioned problems, the invention according to claim 1 is a computer for calculating an expression through a plurality of steps according to a predetermined procedure, and an input for inputting the expression. Means, a mathematical expression storage means for storing the input expression inputted by the input means, an instructing means for instructing the output of an intermediate expression which is a calculation expression at an intermediate step according to the predetermined procedure, and the instructing means. According to the instruction, the intermediate formula of the input formula is calculated according to the predetermined procedure, the calculated intermediate formula is made to be continuous with the input formula, and the intermediate formula is stored in the mathematical formula storage means for storing the input formula. And means for displaying the intermediate formula and the input formula stored in the mathematical formula storage unit by the intermediate formula adding unit.

That is, the intermediate formula adding means calculates the intermediate formula of the input formula in accordance with a predetermined procedure when the instructing means gives an instruction, and stores the calculated intermediate formula in the mathematical formula storing means. Further, the display means displays the intermediate equation stored in the equation storage means. Therefore, it is not necessary to re-execute the calculation from the input expression or to perform the calculation in the reverse direction from the final result each time the instruction means instructs, and if the intermediate expression calculated and stored in the storage means is read, An intermediate expression can be displayed. Therefore, it is possible to display an intermediate formula that immediately responds to the instruction by the instruction means without complicating the calculation process and requiring a long time before the display. Moreover, since the calculated intermediate formula is connected to the input formula and stored in the formula storage means for storing the input formula, it is not necessary to separately prepare a memory area for storing the intermediate formula.

In the invention according to claim 2, the instructing means is a predetermined key provided on the surface of the computer main body. Therefore, the intermediate formula can be displayed by a simple operation of operating a predetermined key.

Further, in the invention according to claim 3, there is further provided a display position designating means for designating a portion displayed by the display means among the input expression and the intermediate expression, and the display means is the above-mentioned The expression portion designated by the display position designation means is displayed. Therefore, even if the display area of the display means is limited, the desired intermediate formula can be displayed by the designation by the display position designation means.

Further, in the invention according to claim 4, further comprising a correction means for correcting the intermediate expression, and the storage means stores the intermediate expression corrected by the correction means as the input expression. , The intermediate formula adding means calculates an intermediate formula of the input formula, makes the calculated intermediate formula continuous to the input formula, and stores the intermediate formula in the mathematical formula storing means for storing the input formula. The intermediate expression and the input expression stored in the mathematical expression storage means are displayed by the intermediate expression adding means. Therefore, when the displayed intermediate formula is modified, the modified formula becomes an input formula, and the intermediate formula for this input formula can be displayed. Therefore, it is possible to easily input a partially different expression without a complicated operation of newly inputting an expression.

According to the invention of claim 5, the program is a program for causing a computer to execute a process of calculating an expression through a plurality of steps according to a predetermined procedure, wherein the input expression input by the input means is expressed by a mathematical expression. Storage processing for storing in the storage means, and calculation processing for calculating an intermediate expression of the input expression according to the predetermined procedure according to an instruction from the instruction means,
The intermediate formula calculated by this calculation process is connected to the input formula and stored in the mathematical formula storage means for storing the input formula, and the intermediate formula addition process stores it in the mathematical formula storage means. The computer is caused to execute a display process for displaying the intermediate formula and the input formula on the display means. Therefore, when the computer executes the process according to the program described in claim 5, it is possible to obtain the same effect as that of the invention described in claim 1.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a calculator 1 according to the present embodiment has a main body 2 that is rectangular in plan view. On the surface of the main body 2, a display unit 3 composed of an LCD, a power / reset key 4, front and rear cursor keys 5, 6, a step key 7, a one-character delete key 8, and a plurality of fraction calculation used when calculating fractions A key 9, a numerical / arithmetic key 10 composed of a plurality of keys surrounded by phantom lines, a quotient digit key 11 and an extra key 12 are provided.

FIG. 2 is a block diagram showing a schematic circuit configuration of the calculator 1. The CPU 13 includes an input unit 14 including the display unit 3 and the keys 4 to 12 via a bus line,
The ROM 15 and the RAM 16 are connected. ROM
A midway result display calculation program shown in a flowchart described later is stored in 15. The RAM 16 is provided with a formula memory 161 for storing a formula (input formula) input to the input unit 14 by a key operation, and a calculation memory 162 used as a work area for calculation. Further, the RAM 16 has a flag area 163 for storing a cursor position, a display position, an intermediate result number, a state (input / intermediate display / result display), and a correction flag (ON / OFF).
Is provided.

In the present embodiment having the above configuration,
When the power supply & reset key 4 is operated and the power is turned on, the CPU 13 executes the processing according to the flowchart shown in FIG. 3 based on the intermediate result display calculation program stored in the ROM 15. That is, the flag is set to state = input (step S1), and the formula memory initial setting process is subsequently executed (step S2).

This formula memory initial setting process (step S
2) is executed according to the flowchart shown in FIG.
First, the formula memory 161 is cleared to erase the remaining previous input formula or intermediate formula (step S201). Next, the cursor position is set to 1 and the cursor position on the formula memory 161 is set to "1" which is the initial position (step S202). In addition, a display N indicating the number of times the intermediate result is displayed
"0" is set to o (step S203), and the display position indicating the first position as the display position of the input character on the display unit = 1 is set (step S204). Further, the initial display process is executed to display the cursor at the first digit of the display unit 8 (step S205).

When the calculation memory initial setting process is completed in this way, the process proceeds from step S2 to step S3 in the flow chart of FIG.
It is determined whether or not (however, the = key is excluded) is operated (step S3). Any number (excluding = key)
When the operation key 10 is operated, it is determined whether or not the flag is status = result display (step S4).

At this time, when the state = result display, the final calculation result of the input formula is displayed on the display unit 8, as will be described later in step S18. Therefore, in this case, after the calculation result of the previous input expression is displayed, the user has begun to input the next new expression by the key operation. Therefore, the process proceeds from step S4 to step S5, and the above-mentioned formula memory initial After executing the setting process, the process proceeds to step S6. If the state is not the result display in the determination in step S4, the process immediately proceeds to step S6.

In step S6, the formula memory 161
A number corresponding to a key operation and an operation are input to the upper cursor position to update the display cursor position, which is the cursor position on the display unit 8, and the formula memory cursor position, which is the cursor position on the formula memory 161, and Memory 1
The stored contents of 61 are updated.

Next, it is determined whether or not the formula memory cursor position is an intermediate position of the formula stored in the formula memory 161 (step S7). If it is in the middle position, the correction flag is turned ON (step S8), and then the display process is executed (step S9). If it is not the middle position but the leading end position, the display process is immediately executed ( Step S9). In this display processing, the calculation formula stored in the formula memory 161 is displayed on the display unit 8 and the cursor is displayed at the position indicated by the formula memory cursor position.

On the other hand, if the result of determination in step S3 is that the number / calculation key has not been operated, it is determined whether or not the step key 7 has been operated (step S10).
If the step key 7 is operated, the interim result No = 0
It is determined whether or not (step S11). here,
If the intermediate result No = 0, after the user inputs the formula,
This is the case when the step key 7 is operated for the first time. In this case, the process immediately proceeds to step S14 to execute the intermediate calculation display process.

If the intermediate result No.noteq.0 as a result of the judgment in step S11, the user operates the step key 7 at least once after inputting the formula, and then operates the step key 7 again. In addition, as will be described later, the display section 8 is in the state of displaying an intermediate expression of the input expression.
In this case, it is determined whether or not the correction flag is ON (step S12). If the correction flag is OFF, the process proceeds to step S14 and the midway calculation display process is executed.

This midway calculation display processing (step S14)
Is executed according to the flowchart shown in FIG. 5, and the display position is first set to the end position + 1 (step S140).
1). That is, the position of the character to be displayed next on the display unit 8 in the formula memory 161 is set next to the end of the formula currently displayed on the display unit 8. That is, in the example 1 attached to FIG. 5, the expression “(5 + 5)” is input to the expression memory 161.
After inputting “× 2 + (2 + 2) × 3”, the step key 7 is operated for the first time, so that the intermediate formula “= 10 × 2 + 4 × 3” is stored in the formula memory 161 following the input formula. It shows the state. When the second step key 7 is operated in this state, step S140 is performed.
By the process of 1, the display position is set next to the end position of “= 10 × 2 + 4 × 3” (next to “3”).

Next, the last formula part of the formula memory 161 is taken out (step S1402). This step S14
By the processing in 02, “10 × 2 + 4 × 3”, which is the last expression part in the example 1, is extracted. Subsequently, in the extracted formula part, the calculation part having the highest priority is designated (step S1403). By the processing in step S1403, “10 × 2 + 4 ×
3 ”, which has the highest priority of“ 10 × 2 ”and“ 4 × ”
3 ”is designated. Further, the calculation is performed for each of the designated calculation parts (step S1404), whereby "1" is calculated.
The calculation result “20” of “0 × 2” and the calculation result “12” of “4 × 3” are calculated.

Next, the original expression parts (“10 × 2”, “4 ×”)
By putting the result of the calculation part ("20", "12") into (3 ") (step S1405)," 20 + 12 "
Is generated, and then "=" is added to the formula memory 161, and
This expression part is input (stored) (step S140).
6). Therefore, by the processing in step S1406, the expression memory 161 stores the input expression up to that point and the intermediate expression “(5 + 5) × 2 + (2 + 2) × 3 = 10 × 2 +.
A series of formulas ((5 + 5) × 2 + (2 + 2) × 3 =, in which the formula part “20 + 12” with “=” added to 4 × 3 ”is added.
10 × 2 + 4 × 3 = 20 + 12 ”is stored.

Subsequently, the flag is set to state = interim result (step S1407), and the interim result No is increased by “1” (step S1408). Therefore, as a result of the processing of step S1408, in the case of example 1,
= 1 ”to“ interim result No = 2 ”. further,
An intermediate result display process is performed (step S1409) to display an intermediate formula corresponding to the operation of the step key 7 this time. As a result, “= 20 + 12” is displayed on the display unit 8.

Further, in the flowchart of FIG. 3, if the result of the determination in step S10 is that the step key 7 has not been operated, it is determined whether or not the = key has been operated (step S15). If the = key is operated,
The formula part at the end of the formula memory 161 is taken out (step S16), and the calculation process is executed (step S17).
Further, the flag is set to the state = result display (step S18), and the initial result “0” is set to the intermediate result No (step S19). Furthermore, by performing result display processing,
The calculation processing result in step S17 is displayed on the display unit 8 (step S20).

Further, as a result of the judgment in step S15,
If no key is operated, the cursor keys 5 and 6
It is determined whether or not is operated (step S21), and if not operated, the process proceeds to another process. When the cursor keys 5 and 6 are operated, the flag is set to state = input (step S22), and the cursor position displayed on the display unit 8 is changed by 1 in the direction designated by the front and rear cursor keys 5 and 6. Yes (step S23). Next, it is determined whether or not the cursor is out of the display range (step S
24) If it is outside the display range, the display position is changed so that the cursor is displayed on the display unit 8 (step S2).
5). Therefore, according to the operation of the cursor keys 5 and 6 by the processing in step S25, the formula memory 161
Any part of the series of expressions stored in can be scroll-displayed on the display unit 8. Therefore, even if the display area of the display unit 3 is limited, the cursor keys 5 and 6
The desired intermediate formula can be displayed by the operation of. If it is within the display, the cursor position on the display of the display unit 8 is simply moved (step S2).
6).

On the other hand, if the determination in step S12 is YES, it means that the intermediate result No.noteq.0 and the correction flag = ON. In this case, after the expression is input, the step key 7 is operated at least once to display the intermediate expression as described above, and the operation of the cursor keys 5 and 6 causes the step S7 to be executed. Is determined to be the middle position of the formula stored in the formula memory 161, and the correction flag is set to O.
This is when N is set.

Further, when the cursor keys 5 and 6 are operated in this manner, the state is input as shown in the above-mentioned step 22, so that the determination in step S4 is NO and the steps from step S4 to step S4 are executed. In step S6, a number is input at the cursor position. Therefore, the example 1 shown in FIG.
Expression “(5 + 5) × 2 + (2 + 2) × 3 = 10 × 2 + 4
In the case of × 3 = 20 + 12, the intermediate expression “10 × 2 + 4 ×”
After matching the cursor to the "2" part of "3", press "2"
When the key “3” is operated with the delete key (not shown) and the numerical value / arithmetic key 10 is operated, the expression of the example 1 in the expression memory 161 becomes “(5 + 5) ×
2+ (2 + 2) × 3 = 10 × 3 + 4 × 3 = 20 + 12 ”
And changes.

If the determination in step S12 is YES in this state, the process proceeds to step S13 and the process of setting the expression portion at the cursor position to a new input expression is executed. This processing is executed according to the flowchart shown in FIG. 4, and the formula portion with the cursor in the middle of the formula memory 161 is taken out (step S1301). Therefore, by the processing in step S1301, the expression “(5 + 5) × 2 + (2 + 2) × 3 = 10 × 3 + 4 × added to FIG.
3 = 20 + 12 ”, the expression part“ 1
0x3 + 4x3 "is taken out. Next, the extracted formula part is set in the formula memory 161 (step S1).
302), and then the above-mentioned steps S203 to S
The processing of 205 is executed.

When the above processing is executed in step S13 in the flowchart of FIG. 3, the intermediate result display processing shown in FIG. 5 is executed in step S14. Therefore, after inputting an expression with the numerical value / arithmetic key 10 and operating the step key 7 to display the intermediate expression, the cursor keys 5 and 6 are used to position the cursor at a desired portion of the intermediate expression, Correct the numbers,
When the step key 7 is operated again, the intermediate formula having the corrected numerical value or the like becomes the input formula, and the intermediate formula of the input formula is displayed. Therefore, it is possible to easily input a partially different expression without a complicated operation of newly inputting an expression.

Note that, as shown as Example 3 in FIG. 5, the intermediate calculation display processing can be applied to the divisor of the fraction. That is, in the example 3, the input expression “1
After the input of “2/30”, the step key 7 is operated for the first time, so that the intermediate expression “=
6/15 ”is stored in the formula memory 161. When the second step key 7 is operated in this state, the processing in step S1401 causes
The display position is set next to the end position of “= 6/15”.

Next, the last expression portion of the expression memory 161 is taken out (step S1402). This step S14
By the processing in 02, “6/15” will be extracted in Example 3. Subsequently, in the extracted formula part, the calculation part having the highest priority is designated (step S1403). By the process in step S1403, "6/15" is designated. Further, calculation (reduction) is performed for each designated calculation portion (step S140).
4), the calculation (approximately) result of “6/15”, “2/5” is calculated.

Next, by inserting the result of the calculation part into the original formula part (step S1405), "2/5" remains as it is, and then "=" is added to the formula memory 161 to input this formula part. (Memorize) (step S14
06). Therefore, by the processing in this step S1406, the expression part “2/5” in which “=” is added to the input expression up to that point and the intermediate expression “12/30 = 6/15” is added to the expression memory 161. A series of formulas "12/30 = 6"
/ 15 = 2/5 "is stored.

Subsequently, the flag is set to state = interim result (step S1407), and the interim result No is increased by “1” (step S1408). Therefore, as a result of the processing in step S1408, in the case of the example 3, “interim result No
= 2 ”. Further, an intermediate result display process is performed (step S1409) to display the intermediate formula corresponding to the operation of the step key 7 this time. As a result, “= 2/5” is displayed on the display unit 8.

[0037]

As described above, according to the present invention, the intermediate formula of the input formula is calculated according to a predetermined procedure in accordance with the instruction from the indicating means, and the calculated intermediate formula is stored in the mathematical formula storage means. To re-execute the calculation from the input formula,
It is not necessary to perform the calculation in the reverse direction from the final result, and the intermediate formula can be displayed by reading the intermediate formula calculated and stored in the storage means. Therefore, the intermediate process can be displayed promptly in response to the instruction by the instructing means without complicating the calculation process and requiring a long time before the display. Moreover, since the calculated intermediate formula is connected to the input formula and stored in the formula storage means for storing the input formula, it is not necessary to separately prepare a memory area for storing the intermediate formula.

Therefore, it is possible to sequentially display or redisplay intermediate formulas by an easy-to-understand operation without requiring a special intermediate result memory and performing complicated intermediate result calculation.

[Brief description of drawings]

FIG. 1 is a plan view of a calculator according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an outline of a circuit configuration of the calculator.

FIG. 3 is a flowchart showing a processing procedure according to the embodiment of the present invention.

FIG. 4 is a flowchart showing details of a process of initializing the formula memory and setting a formula part of a cursor position to a new input formula.

FIG. 5 is a flowchart showing details of midway calculation display processing.

[Explanation of symbols]

1 calculator 2 body 3 Display 5 Previous cursor key 6 Rear cursor key 7 step keys 8 Display 10 Numerical value / Calculation key 13 CPU 14 Input section 15 ROM 16 RAM 161 Formula memory

Claims (5)

[Claims] 1. A computer for calculating an expression through a plurality of steps according to a predetermined procedure, the input means inputting the expression, the mathematical expression storage means for storing the input expression input by the input means, and the predetermined expression. Instructing means for instructing the output of an intermediate expression which is a calculation expression at an intermediate stage according to the procedure of 1., and calculating the intermediate expression of the input expression according to the predetermined procedure according to the instruction by the instructing means. The intermediate formula adding means for connecting the intermediate formula to the input formula and storing it in the mathematical formula storing means for storing the input formula, and the intermediate formula and the input stored in the mathematical formula storing means by the intermediate formula adding device. A computer comprising a display unit for displaying an expression. 2. The instructing means is a predetermined key provided on the surface of the computer body.
The calculator shown. 3. A display position designating means for designating a part to be displayed on the display means out of the input formula and the intermediate formula, wherein the display means displays the formula part designated by the display position designating means. The computer according to claim 1, which is displayed. 4. The correction means for correcting the intermediate expression is further provided, wherein the storage means stores the intermediate expression corrected by the correction means as the input expression, and the intermediate expression adding means includes the input expression. Calculate the intermediate formula of
The calculated intermediate formula is continued to the input formula and is stored in the mathematical formula storage unit that stores the input formula, and the display unit stores the intermediate formula stored in the mathematical formula storage unit by the intermediate formula adding unit. The computer according to claim 1, wherein the input formula is displayed. 5. A program for causing a computer to execute a process of calculating an expression through a plurality of steps according to a predetermined procedure, the storage process storing an input expression input by the input means in the mathematical expression storage means, and an instruction means. According to the instruction by the calculation process, the intermediate formula of the input formula is calculated according to the predetermined procedure, and the intermediate formula calculated by the calculation process is continued to the input formula, and the formula storage for storing the input formula is performed. A calculation for causing a computer to execute an intermediate formula addition process to be stored in the means, and a display process for displaying the intermediate formula and the input formula stored in the mathematical formula storage device on the display device by the intermediate formula addition process. Processing program.