JPH07105140A - Electronic computer - Google Patents

Abstract

PURPOSE:To provide an electronic computer which can know the arithmetic result of a part (halfway in arithmetic) of an inputted arithmetic expression. CONSTITUTION:This electronic computer is equipped with an arithmetic control part 11, a key input part 13, a storage part 17, and a display part 19, and numerals which constitutes mathematical expression and arithmetic symbols are inputted from a key input part 13 and stored in a storage part 17 and the mathematical expression is displayed at a display part 19. The arithmetic control part 11. When it detects the part which can be operated in the mathematical expression stored in the storage part 17, executes it, substitutes an arithmetic result for the corresponding part of the mathematical expression stored in the storage part 17, and shortens the intervals of data at need. Consequently, the arithmetic result is displayed at the display part 19 instead of the arithmetic expression.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a format display type electronic computer for displaying an input arithmetic expression, and more particularly to displaying an input arithmetic expression and executing an arithmetic operation of a computable portion and executing the arithmetic operation. The present invention relates to an electronic computer that displays a calculation result instead of a calculation formula.

[0002]

2. Description of the Related Art There is known a small format display type electronic computer for inputting and displaying a mathematical expression (arithmetic expression) to be executed and finally performing an operation collectively. This kind of small computer
For example, when calculating “1 + 2 × 3 × 4”, the input mathematical expression “1 + 2 × 3 × 4” is displayed on the display unit and “=” is displayed.
When the key is input, the calculation is collectively performed, and the calculation result “25” is displayed.

[0003]

As described above, in the conventional format display type small computer, since all the mathematical expressions are inputted and the calculations are collectively executed, it is possible to know the calculation result in the middle. There was a problem that I could not. For example, in the above mathematical expression, even when it is desired to know the result of a partial operation (intermediate operation) such as “2 × 3”, there is a problem that the result cannot be obtained by the conventional small-sized electronic computer. Further, there is a drawback that a large display area is required because the input mathematical formula is displayed as it is.

The present invention has been made in view of the above situation, and an object thereof is to provide an electronic computer capable of knowing a calculation result of a part (halfway calculation) of an input mathematical formula. Further, the present invention provides an electronic computer capable of displaying an input mathematical formula, detecting and executing a calculable part in the displayed mathematical formula, and notifying a user of a calculation result of the executed part. With the goal.

[0005]

In order to achieve the above object, an electronic computer according to the present invention is provided with a numerical key and an arithmetic symbol key, input means for sequentially inputting mathematical formulas, and input by the input means. Storage means for storing the mathematical expression, display means for displaying the mathematical expression stored in the storage means, judgment means for judging that all or part of the mathematical expression stored in the storage means can be operated, In response to the judgment of the judgment means, there is provided an arithmetic control means for executing the arithmetic operation of the arithmetically operable part of the mathematical expression, changing the execution result of the arithmetic operation to the display of the arithmetic operation executing part and displaying it on the display means. .

[0006]

With the above configuration, for example, "9 + 8"
When performing the operation of “× 7 ÷ 6”, “1 + 2 × 3”
÷ ”is input from the input means, the operation control means detects that the partial operation“ 2 × 3 ”can be executed, executes this operation (intermediate operation), and outputs the operation result“ 56 ”. It is displayed on the display means in place of the executed calculation “8 × 7”. Therefore, the display is, for example, “1 + 56 ÷”. Therefore, according to the electronic computer of the present invention, the result of the intermediate calculation can be easily grasped on the display screen despite the format display method.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An electronic computer according to an embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the computer according to this embodiment includes a CPU 11 and a CPU 11.
Key input unit 13, ROM 15, RAM 1 connected to
7, a display unit 19, and a calculation availability determination unit 21.

The CPU 11 functions as an arithmetic unit that executes the input mathematical formula and also functions as a control unit that controls each unit connected to the CPU 11. The CPU 11 is composed of, for example, a one-chip microprocessor or the like.

The key input unit 13 is, to the CPU 11, numeral keys "0" to "9" for inputting numerical values, and operation symbol keys "+", "-", "x" for inputting operation symbols. ,
“÷”, an equal (“=”) key for instructing execution of calculation, control keys such as a clear key, and other keys.

The ROM 15 stores the operation program of the CPU 11, fixed data and the like. The RAM 17 is for storing input data, progress of calculation, calculation result, and the like, and includes an input register 171 and a calculation register 173 as shown in FIG.

The input register 171 stores numerical values and operation symbols input from the key input unit 13 in the order of input. Of the data stored in the input register 171, the data in the lower area is displayed on the display unit 19. Calculation register 1
Reference numeral 73 is used as a work area when the CPU 11 executes a calculation.

The display unit 19 is composed of a dot matrix type liquid crystal display device or the like, and displays the data stored in the display area among the data stored in the input register 171.

The calculation propriety judging section 21 judges whether or not there is an executable calculation part in the input mathematical expression (the mathematical expression stored in the input register 171), and the judgment result is CP.
Notify U11.

Next, the operation of the electronic computer according to this embodiment will be described with reference to FIGS. 4 and 5 by taking the case of executing the operation of the mathematical expression of “1 + 2 × 3 × 4” as an example. FIG. 3 shows FIG.
4 is a flowchart showing the operation of the electronic computer shown in FIG.
[Fig. 6] is a diagram showing a key input procedure and a change in display when the above calculation is executed.

When the power of this computer is turned on, C
The PU 11 executes an initialization process (not shown), clears the input register 171, and then starts the process shown in FIG.

When executing the above calculation, the operator first inputs (operates) the numeral key "1" as shown in FIG. 4 (A). This key input is detected in step S1, it is determined that the key operated in step S2 is a numeral key, and numeral processing is executed in step S3.

In this numeral processing, the CPU 11 sets the numerical value input to the input register 171. When the display portion of the input register 171 is full, the stored data is shifted to the upper digit side by one digit and the input numerical value is set to the lowest digit. For example, when the numerical value “4” is input in the display state shown in FIG. 5A, the display data is shifted to the upper digit by one digit as shown in FIG. 5B.
The most significant digit "1" disappears) and the input numerical value "4" is set to the least significant digit. In addition, the CPU 11
The overflow of input data is checked, and if an overflow occurs, a predetermined error process is performed.

In this example, "1" is set in the most significant digit of the display portion of the input register 171, and the input numerical value "1" and the cursor indicating the input position are displayed on the display unit 19 as shown in FIG. 4 (A). Is displayed in. When the above processing is completed, the flow returns to step S1 to wait for the next key input.

Next, the operator operates the operation symbol key "+" as shown in FIG. 4 (B). In this case, it is determined in step S4 that the operation symbol key has been operated through steps S1 and S2, and the flow proceeds to step S5. In step S5, the calculation propriety determination unit 21 determines whether or not there is a calculation-possible (intermediate calculation) part in the input mathematical expression. At this stage, since only "1+" is input, the operation cannot be performed. Therefore, the calculation propriety determination unit 21 determines “NO”, and the flow proceeds to step S6 to perform display processing. In step S6, the CPU 11 sets the operation symbol "+" in the input register 171 (if necessary, the input data shift, overflow check, and the like are also executed similarly to the value number processing). Therefore, the display unit 19 displays the cursor "10+" as shown in FIG. afterwards,
The flow returns to step S1.

Next, the operator inputs the numeral key "2" as shown in FIG. 4 (C). In this case, the flow goes to step S3 through steps S1 and S2. In the numeral processing of step S3, the CPU 11 sets “2” in the input register 171. Therefore, as shown in FIG. 4C, the cursor “1 + 2” is displayed on the display unit 19.

Next, the operator inputs the operation symbol key "x" as shown in FIG. 4E. In this case, the flow goes to step S5 through steps S1, S2, S4, and the calculation propriety determination unit 21 determines whether mid-course calculation is possible. At this stage, only “1 + 2 ×” has been input, so the operation cannot be performed. Therefore, the calculation availability determination unit 21 determines “NO”, and the flow proceeds to step S6. In step S6, the CPU 11 sets the operation symbol “×” in the input register 171. For this reason,
The display unit 19 displays the mathematical expression “1 + 2 ×” as shown in FIG.
And the cursor is displayed. After that, the flow is step S1.
Return to.

Next, the operator inputs the numeral key "3" as shown in FIG. 4 (E). Then, the flow goes to step S3 through steps S1 and S2. Step S
In 3, the CPU 11 sets “3” in the input register 171. Therefore, the display on the display unit 19 is as shown in FIG.

Next, the operator inputs the operation symbol key "x" as shown in FIG. 4 (F). In this case, the flow goes to step S5 through steps S1, S2, and S4, and the calculation propriety determination unit 21 determines whether mid-course calculation is possible. At the stage when "1 + 2 × 3 ×" is input, the intermediate calculation of "2 × 3" is possible, and step S5
Then, the determination is “YES”, and the flow proceeds to step S7. In step S7, the CPU 11 executes the intermediate calculation “2 × 3” to obtain the calculation result “6”.

Next, the CPU 11 performs post-calculation display processing in step S8. That is, the CPU 11 sets the calculation result “6” in the input register 171 in place of the executed calculation “2 × 3”, and further performs the processing of filling the display (eliminating the space). Therefore, the display on the display unit 19 is as shown in FIG. When replacing a part of the formula with the calculation result, if the calculation result has a larger number of digits than the executed formula, for example, after shifting the display data and securing the area for displaying the calculation result, , Perform the replacement process.

Next, the operator inputs the numeral key "4" as shown in FIG. In this case, the flow is S
The CPU 11 sets "4" in the input register 171 through steps S1, S2 and S3. Therefore, the display on the display unit 19 is as shown in FIG.

Since the input of the mathematical expression is completed, the operator operates the "=" key as shown in FIG. 4 (G). In this case, the flow goes to step S9 through steps S1, S2 and S4. In step S9, it is detected that the operated key is the "=" key, and the flow proceeds to step S10. In step 10, CPU
11 executes the mathematical expression stored in the input register 171, that is, the calculation of “1 + 6 × 4”, and the calculation result “25”.
To get Next, in step S11, the CPU 11 clears the contents of the input register 171, and the calculation result “2
5 ”is set in the display area of the input register 171. Therefore, the display on the display unit 19 is as shown in FIG.

When a key other than the numeric key, the operation symbol key, and the "=" key is input, for example, the clear key, the flow goes to step S12 via steps S1, S2, S4, S9, and the input. The process corresponding to the key is executed.

As described above, according to this embodiment, in the format display type electronic computer, the intermediate calculation of the input mathematical formula is sequentially executed and the calculation result is displayed instead of the calculation formula. Therefore, the operator can execute the calculation while confirming the calculation result of the intermediate calculation.

The present invention is not limited to the above embodiment, and various applications and modifications are possible. For example, in the above embodiment, the input data is displayed in order from the upper digit of the display unit, but it may be displayed in order from the lower digit. In this case, in steps S3, S6, S8, S11, etc., the data set in the input register 171 is shifted to the upper digit by one digit, and then the newly input numerical value or operation symbol is set in the lowermost digit. FIG. 6 shows an example of the key operation procedure (same as the procedure shown in FIG. 4) and display changes in this case. Further, as shown in FIG. 6 (F), when the operation result is replaced with an operation expression, a symbol indicating the replaced part (FIG. 6 (F)
Underline) may be displayed.

In the above embodiment, the display unit 19 is a dot matrix type display unit, but other types of display units may be used. In addition, the key input unit 13 is provided with a selection key for a mode for executing the above intermediate calculation and a mode for not executing the conventional intermediate calculation, and only when the intermediate calculation mode is selected,
You may make it perform the above-mentioned intermediate calculation. In this case, for example, a step of determining the mode is added before step S1 of FIG. 3, and when the mode is the intermediate calculation execution mode, the process proceeds to step S1, and when the mode is the conventional mode,
A generally known conventional processing procedure may be executed.

[0031]

As described above, according to the present invention, it is possible to execute a calculation in an electronic computer of a type that displays a mathematical formula while confirming the calculation result of the intermediate calculation.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a configuration of a RAM shown in FIG.

FIG. 3 is a flowchart for explaining a main part of the operation of the electronic computer shown in FIG.

FIG. 4 is a diagram showing a key operation procedure and a change in display on a display unit when executing a calculation of “1 + 2 × 3 × 4”.

FIG. 5 is a diagram for explaining the operation of the CPU when the display section is full of display.

FIG. 6 is a diagram showing another example of display on the display unit.

[Explanation of symbols]

11 ... CPU, 13 ... Key input unit, 15 ... ROM,
17 ... RAM, 19 ... Display unit, 21 ... Computability determination unit, 171 ... Input register, 173 ... Computation register

Claims (2)

[Claims] 1. An input unit, which comprises a numerical key and an operation symbol key, for sequentially inputting mathematical formulas, a storage unit for storing mathematical formulas input by the input unit, and a mathematical formula stored in the storage unit. Display means, judging means for judging that all or part of the mathematical formulas stored in the storing means can be calculated, and in response to the judgment of the judging means, executes the calculation of the operable part of the mathematical formulas. Then, the electronic computer is provided with an operation control means for changing the execution result of the operation to a display of the operation executing portion and displaying it on the display means. 2. An input unit, a display unit, and an arithmetic control unit, wherein numerical values and arithmetic symbols constituting an arithmetic expression are sequentially input from the input unit, the inputted arithmetic expression is displayed on the display unit, and the arithmetic operation is performed. In the electronic computer that executes the calculation displayed on the display unit by the control unit, the calculation control unit includes a unit that determines that at least a part of the input arithmetic expression can be calculated. An electronic computer comprising means for executing the calculation of 1., changing to the calculation execution part of the calculation formula, and displaying the calculation result of the calculation on the display section.