JPH07105141A - Electronic computer - Google Patents

Abstract

PURPOSE:To display the contents of arithmetic being executed and easily grasp them on a display screen by displaying an arithmetic symbol of a front stage and an arithmetic symbol of a rear stage on a display means together with numerals when the arithmetic symbols are inputted. CONSTITUTION:A display part 19 displays the numerals, arithmetic symbols, etc., under the control of a CPU 11. For example, when arithmetic '1+2X3' is performed, the arithmetic symbols '+' and 'X' of the front and rear stages are displayed at the display part 19 together with the numeral '2' when the arithmetic symbol 'X' is inputted. For example, when arithmetic '1+2X-' is executed according to the rule completely based upon the mathematical expression, halfway arithmetic '2X3' should be done before other parts are calculated. In this case, the halfway arithmetic is performed in the step where the arithmetic symbol '-' is inputted, and the result '6' and the arithmetic symbols '+' and '-' of the front and rear stages may be displayed. Thus, the number and the arithmetic symbols of the stages before and after the numeral are displayed at the display part 19, so the contents of the arithmetic being executed can be grasped and the operation is facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an electronic computer,
In particular, the present invention relates to a small-sized computer that can display operation symbols (operators) located at the front and rear of the displayed arithmetic expression.

[0002]

2. Description of the Related Art In a conventional electronic computer, a display device is included in the contents of calculation except for a format display type electronic computer (a type in which a calculation format is collectively input / displayed and then calculation is performed). Only the numerical value and one operation symbol are displayed in. The operation of this conventional electronic computer will be specifically described with reference to FIG. 6 (A) to 6 (F) show “1
The key input procedure and the change of the display when calculating "+ 2x3" are shown. In this case, the operator inputs the keys in the order of "1", "+", "2", "x", "3" as illustrated. Then, in response to the input, the display changes in the order shown in FIGS. 6 (A) to 6 (F).

[0003]

That is, what is displayed on the display unit is a numerical value, or a numerical value and one operation symbol, as shown in FIG. Moreover, the displayed operation symbol may be before or after the displayed numerical value. Moreover, since only one operation symbol is displayed, the type of operation previously performed cannot be confirmed on the display. For this reason, there is a problem that it may be difficult to grasp the contents of the calculation being executed. This problem becomes noticeable in the case of a small computer for education which is targeted at school children who have not yet handled an electronic computer.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electronic computer which can easily grasp the contents of a calculation being executed on a display screen.

[0005]

In order to achieve the above object, an electronic computer according to the present invention is provided with a numeric key and a function key, key input means for sequentially inputting arithmetic expressions, and numerical value display for displaying numerical values. Section, a pre-stage operation symbol display section for displaying a pre-stage computation symbol for the numerical value displayed on the numerical value display section, and a pre-stage computation symbol display section for displaying a post-stage arithmetic symbol for the numerical value displayed on the numeric value display section. Display means provided, storage means for storing the operation symbol input by the input means, key input means, the display means and storage means, and the numerical value and function input from the key input means Set it in the memory,
The calculation is executed according to the contents of the storage means, and further, the numerical value or the calculation result is displayed on the numerical value display unit,
The preceding operation symbol of the numerical value displayed on the numerical value display unit is displayed on the preceding operation symbol display unit, and the subsequent operation symbol subsequent to the numerical value displayed on the numerical value display unit is displayed on the subsequent operation symbol display unit. The present invention is characterized by including a control means, and having a function of displaying an operation symbol at a front stage and a rear stage in an arithmetic expression of a displayed numerical value.

[0006]

With the above-described configuration, the electronic computer according to the present invention, for example, when executing the operation "1 + 2 × 3", enters the preceding stage together with the numeral "2" at the stage when the operation symbol "x" is input. The operation symbol "+" and the operation symbol "x" in the subsequent stage are displayed on the display means. Therefore, the content of the calculation being executed can be easily grasped on the display.

Further, for example, when the operation of "1 + 2 × 3-4" is executed in accordance with the rule according to the complete mathematical formula, it is necessary to perform the intermediate operation "2 × 3" before the operation of other parts. In such a case, an intermediate operation is performed at the stage when the operation symbol “-” is input, and as a result, “6” and the operation symbol “+” at the preceding stage are executed.
Alternatively, the operation symbol "-" in the subsequent stage may be displayed. As described above, according to the present invention, since the numerical value and the operation symbols before and after the numerical value are displayed on the display unit,
The contents of the calculation being executed can be easily grasped and the operation becomes easy.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An electronic computer to which an embodiment of the present invention is applied 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 1.
Key input unit 13, ROM 15 and RAM 1 connected to 1
7, a display unit 19, and a calculation availability determination unit 21.

The CPU 11 constitutes an arithmetic unit for sequentially executing arithmetic operations of executable parts according to an inputted numerical value (numerical value) and an arithmetic symbol, and a control unit for controlling the operation of each unit connected to the CPU 11. CPU11, ROM15, R
The AM 17 and the operation propriety determination unit 21 are configured by one chip as a one-chip microprocessor, for example.

The key input unit 13 causes the CPU 11 to input numeral keys "0" to "9" for inputting numerical values, and function keys "+", "-" for inputting operation symbols.
It has other control keys such as "x", "÷", "=", and a clear key.

The ROM 15 stores the operation microprogram of the CPU 11, fixed data and the like. RAM17 is
It is for storing input data, progress of calculation, calculation result, etc., and as shown in FIG.
1 and an arithmetic register 173.

The display register 171 is a numerical value register 1
81, a first function register 183, and a second function register 185. Number register 181
Is numerical data to be displayed on the numerical display unit 191.
For example, the input numerical data, the numerical data of the calculation result, etc. are set by the CPU 11. In the first function register 183, the first function display unit 1
93 is not displayed, "0" is displayed, "1" is displayed when the "+" sign is displayed, and "2" is displayed when the "-" sign is displayed.
However, the CPU 11 sets “3” when displaying the “x” symbol and “4” when displaying the “÷” symbol.

The display unit 19 displays numerical values, operation symbols, etc. under the control of the CPU 11, and as shown in FIG.
A numerical value display unit 191 and first and second function display units 193 and 195 are provided. The numerical display unit 191 uses a 7-segment (8-shaped) display element with a predetermined digit number (for example, 8 digits).
It has a digit or 12 digits), and displays the numerical value such as the numerical value stored in the numerical value register 181, the result of the intermediate calculation and the calculation result. The first function display unit 193 is composed of a dot-matrix type liquid crystal display unit, and is provided in the subsequent stage of the operation symbol corresponding to the data stored in the first function register 183, that is, the numerical value displayed on the input operation formula. Display the located operation symbol (the operation symbol entered after the displayed number). Second function display section 19
5 is composed of a dot matrix type liquid crystal display unit, and an operation symbol corresponding to the data stored in the second function register 185, that is, an operation symbol in the preceding stage of the displayed numerical value (input before the displayed numerical value. The calculated operation symbol) is displayed.

In the second function register 185,
“0” is displayed when the second function display unit 195 is not displayed, and “1” is displayed when the “+” sign is displayed.
When displaying the "-" symbol, "2" is displayed, when displaying the "x" symbol, "3" is displayed, and when displaying the "÷" symbol, "4" is displayed.
Are set by the CPU 11, respectively. Input arithmetic expressions are sequentially stored in the arithmetic register 173 by the CPU 11, and are used by the CPU 11 as a work area for arithmetic operations.

When the function key is operated, the operation propriety judging section 21 judges whether or not there is an executable part of the input arithmetic expression, and the judgment result is determined by the CPU.
Notify 11

Next, referring to FIGS. 4 and 5, the operation of the electronic computer according to this embodiment will be described with reference to an example in which the operation of “10 + 2 × 3-4” is executed in accordance with the rules of the complete mathematical formula. Explain. FIG. 4 is a flowchart showing a main part of the operation of the electronic computer according to this embodiment, and FIG. 5 is a diagram showing a key input procedure and a change in display when executing the above calculation.

When the power of this electronic computer is turned on, C
The PU 11 executes an initialization process (not shown), sets “0” in each of the numerical register 181, the first function register 183, and the second function register 185, 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. 5 (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 numerical processing, the CPU 11 causes the numerical value register 18
If the value stored in 1 is other than "0", set it to 1
The number is shifted to the upper digit, the numerical value set in the first digit is set, and the numerical value is displayed on the numerical display section 191. Also, the overflow of the numerical value is checked, and when the overflow occurs, a predetermined error processing is performed. In this example, "1" is set in the least significant digit of the number register 181, and
As shown in (A), it is displayed on the display unit 19.

Next, it is judged whether or not the input number is the first number for inputting one number (step S4). In this example, the input number "1" is the number "10"
Is the first numerical value that represents, and is determined as “YES” in step S4, and the flow proceeds to step S5. Step S5
At, the contents of the first function register 183 are transferred to the second function register 185. In this example, the content of the first function register 183 is reset to “0” by the initialization process, and “0” is set to the second function register 185. When the above processing is completed, the flow returns to step S1 to wait for the next key input.

The operator then inputs the "0" key.
Then, the fact that the numeric key has been operated indicates that step S1,
The determination is made in S2, and the flow proceeds to step S3. In step S3, "1" stored in the first digit of the numerical register 181 is shifted to the second digit, and the numerical value "0" set in the first digit is set. Therefore, the display unit 19 is shown in FIG.
As shown in (B), "10" is displayed.

Next, it is judged whether or not the input number is the first number (step S4). Since “0” is the second number and not the first number, the flow is the step S.
The process returns to step S1 without performing the process of 5.

Next, the operator presses the function key "+".
To operate. In this case, it is determined in step S6 that the function key has been operated through steps S1 and S2, and the flow proceeds to step S7. In step S7, the numerical value "1" corresponding to the function key "+" input to the first function register 183 is set. Therefore, as shown in FIG.
The function display unit 181 displays a calculation symbol “+” located after the numerical value “10” displayed on the numerical display unit 191 in the calculation formula.

Next, the operation availability determination unit 21 determines whether or not the operation is possible based on the input contents (step S8). At this stage, since only "10+" is input, the calculation cannot be performed. Therefore, the calculation propriety determination unit 21 determines “NO”, and the flow returns to step S1.

Next, the operator inputs the numeral key "2". The flow goes to step S3 through steps S1 and S2. In the registration process of step S3, the CPU 11
Sets "2" to the first digit of the number register 181. Therefore, as shown in FIG. 5D, “2” is displayed on the numerical display unit 191. Since the numeral "2" is the first numeral that represents one number, "YE" is selected in step S4.
S ”, the value“ 1 ”corresponding to“ + ”stored in the first function register 183 is transferred to the second function register 185, and the content of the first function register 183 is“ 0 ”in step S5. "
Will be cleared. Therefore, the display of the display unit 19 is as shown in FIG.
As shown in (D), the numerical value display unit 191 displays the numeral "2", and the second function display unit 195 is positioned before "2" in the arithmetic expression (before "2"). The "+" which is the operation symbol that has been input is displayed and nothing is displayed on the first function display portion 193.

Next, the operator operates the function key "x". In this case, the flow is step S1,
After steps S2, S6, step S7 is reached. Step S7
In, the CPU 11 determines that the value “3” corresponding to the operation symbol “×” input to the first function register 183.
Set. Therefore, the first function display unit 1
At 93, the symbol "x" is displayed as shown in FIG. That is, at this stage, the numeral "2" is displayed together with the operation symbols "+" and "x" in the preceding and subsequent stages, and the operator can judge the contents of the calculation being executed from the displayed contents. Next, in step S8, the calculation availability determination unit 21 determines whether or not the calculation is possible. When “10 + 2 ×” is input, there is no part that can be calculated. For this reason,
In step S8, "NO" is determined and the flow returns to step S1.

Next, the operator inputs the numeral key "3". Then, the flow goes to step S3 through steps S1 and S2. In the numerical processing of step S3, CP
U11 sets "3" in the first digit of the numerical value register 181. Therefore, the numerical display portion 191 is displayed in FIG.
As shown in, “3” is displayed instead of “2”.
Since the number "3" is the first number, it is determined to be "YES" in step S4, and the first function register 1
The value "3" corresponding to the operation symbol "x" stored in 83 is transferred to the second function register 185, and the value of the first function register 183 is cleared to "0". Therefore, as shown in FIG. 5 (F), the numeral display portion 191 displays the numeral "3", the second function display portion 195 displays the preceding operation symbol "x", and the first function Nothing is displayed on the display unit 193.

Next, the operator operates the function key "-". In this case, the flow is step S1,
The process goes to step S7 through S2 and S6. In step S7, the value "2" corresponding to the operation symbol "-" is set in the first function register 183, and the operation symbol "-" is displayed on the first function display portion 193. Next, in step S8, the operation availability determination unit 21 determines whether or not the operation is possible. At the stage when “10 + 2 × 3−” is input, the intermediate calculation of “2 × 3” is possible,
In step S8, it is determined to be "YES", and step S9
, The operation “2 × 3” is executed and the numerical value register 18
The calculation result “6” is set to 1 and the numerical value display section 19
“6” is displayed in 1.

Further, in step S10, the CPU
Reference numeral 11 corrects the content of the second function register 185 based on the content of the operation register 173 according to the advance of the operation level. That is, the CPU 11 sets, in the second function register 185, the numerical value corresponding to the operation symbol located before the portion where the intermediate operation is executed.
In this example, the value “1” corresponding to the operation symbol “+” located before the operation expression “2 × 3” is set in the second function register 185. Therefore, the display unit 19 displays the numerical value “6” on the numerical display unit 191 as shown in FIG.
, And the operation symbol “−” in the latter stage of “2 × 3”, which is the operation for obtaining the numerical value “6”, is displayed in the first function display unit 193.
, And the operation symbol “+” in the previous stage of the operation is displayed on the second function display section 195. After that, the flow returns to step S1.

Next, the operator inputs the numeral key "4". In this case, the flow goes through steps S1 and S2 to step S3.
Leading to. In the registration process of step S3, the CPU 11
Sets "4" to the first digit of the number register 181,
The numerical value display unit 191 displays “4”. Since the number "4" is the first number, it is determined to be "YES" in step S4, and the value "2" corresponding to "-" stored in the first function register 183 is transferred to the second function register 185. Then, the value of the first function register 183 is cleared to “0”. As shown in FIG. 5 (H), the display unit 19 displays a numeral “4” on the numerical display unit 191 and the second function display unit 195.
"-", Which is the operation symbol of the previous stage, is displayed on the screen, and nothing is displayed on the first function display unit 193.

Next, the operator operates the function key "=". In this case, the flow is step S1,
The process goes to step S7 through S2 and S6. In step S7, since the operated function key is “=”, no value is set in the first function register 183 (a value corresponding to = may be set). Next, the calculation propriety determination unit 21 determines whether calculation is possible. When the "=" key is operated, all the calculations are possible, and it is determined to be "YES" in step S8, the calculation "10 + 6-4" is executed in step S9, and the calculation result is stored in the numerical value register 181. A certain "12" is set, and the first and second function registers 183,
The content of 185 is cleared to "0". As a result, the calculation result "12" is displayed on the numerical display unit 191 as shown in FIG.
It is displayed as shown in.

When a key other than the numerical keys or function keys, for example, the clear key is input, the flow goes through steps S1, S2, S6 and step S11.
In step S11, the process corresponding to the input key is executed.

As described above, according to this embodiment, by providing the first and second function display portions and the first and second function registers, it is possible to display the operation symbols in the preceding and subsequent stages for the displayed numerical value. . In other words, the previously entered operation symbol and the operation symbol entered this time can be displayed simultaneously. Therefore, the operator can check the operation symbols before and after the displayed numerical value at any time, and can easily understand the content of the operation being executed, which is effective for a small computer for education.

The present invention is not limited to the above embodiment, and various applications and modifications are possible. For example, the positions of the first and second function display portions may be any positions on the display portion 19. In the above embodiment, the numerical value display unit 191 is an 8-segment type display unit and the function display units 193 and 195 are dot matrix type display units. However, for example, the entire display unit 19 is a dot matrix type display unit. May be In the above embodiment, the display of the second function display unit 195 is corrected based on the content of the calculation register 173 when the intermediate calculation is executed. However, for example, every time the value of the second function register 185 is updated. Alternatively, the value may be saved, and the display may be corrected based on the saved value. In the above embodiment, an example in which the present invention is applied to an electronic computer that performs an operation according to a rule as a complete mathematical expression is shown.
It can also be applied to other types of electronic computers.

[0034]

As described above, according to the present invention, the operation symbols before and after the displayed numerical value can be displayed simultaneously.
Therefore, the operator can confirm the operation symbols before and after the displayed numerical value at any time, and can easily understand the content of the operation being executed, which is extremely effective.

[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 display unit shown in FIG.

FIG. 3 is a diagram showing a configuration of a RAM shown in FIG.

FIG. 4 is a flowchart for explaining a main part of the operation of the electronic computer shown in FIG.

FIG. 5 is a diagram showing a case of executing an operation of “10 + 2 × 3-4”
It is a figure which shows the procedure of a key operation, and the change of the display of a display part.

FIG. 6 is a diagram showing a key operation procedure and a display change of a display unit in a conventional electronic computer.

[Explanation of symbols]

11 ... CPU, 19 ... Display unit, 15 ... ROM, 17 ...
..RAM, 19 ... Key input section, 21 ... Computability determination section, 191 ... Numerical value display section, 193 ... First function display section, 195 ... Second function display section, 17
1 ... Display register, 173 ... Arithmetic register, 18
1 ... Numerical value register, 183 ... First function register, 185 ... Second function register

Claims (3)

[Claims] 1. A key input means for sequentially inputting arithmetic expressions, comprising numerical keys and function keys, a numerical value display section for displaying numerical values, and an operation symbol at a preceding stage for the numerical value displayed on the numerical value display section. And a display unit having a front-stage operation symbol display unit for displaying a rear-stage operation symbol display unit for displaying the numerical value displayed on the numerical value display unit, and a storage unit for storing the operation symbol input from the input unit. And, connected to the key input means, the display means and the storage means, sets the numerical value and the function input from the key input means in the storage means, and executes an operation according to the contents of the storage means, Further, the numerical value or the calculation result is displayed on the numerical value display unit, and the operation symbol of the previous stage of the numerical value displayed on the numerical value display unit is displayed on the previous stage operation symbol display unit, and Computer, characterized in that the subsequent operation symbol that follows the number displayed on the value display unit having a control unit, to be displayed on the subsequent operation symbol display unit. 2. The control means judges whether or not the calculation is possible by at least a part of the inputted arithmetic expression, and when the calculation is performed according to this judgment, the preceding arithmetic symbol display section is displayed. 2. The electronic computer according to claim 1, further comprising means for displaying an operation symbol located in front of the portion where the operation is executed. 3. 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, and the arithmetic control unit sequentially executes arithmetic operations according to the input. In the electronic computer that displays the calculation result on the display unit, the calculation control unit includes a unit that causes the display unit to simultaneously display a numerical value and a calculation symbol located in a preceding stage and a subsequent stage of the numerical value on the calculation formula. Characteristic electronic calculator.