JPH08227400A - Electronic computer - Google Patents

Abstract

PURPOSE: To prevent the execution of succeeding useless key entry operation by informing an input operator of current status when key entry operation and a rounding state for a test are different from that of 1st calculation. CONSTITUTION: This electronic computer is provided with an input means 5 for inputting numerical/operation instruction data, rounding specifying means 6, 7 for specifying whether digits less than the prescribed digits of a decimal point are to be rounded or omitted, an arithmetic means (CPU) 2 for executing operation in a specified rounding state based upon the inputted numerical/ operation instruction data, display means 8, 9 for displaying numerical data/ operated result data, a storage means 4 for storing numerical/operation instruction/rounding state data, and an informing means (CPU) 2 for comparing the preceding numerical/operation instruction/rounding state data stored in the means 4 with current numerical/operation instruction/rounding state data, and when the preceding data do not coincide with the current data, displaying the non-coincident data on the display means 9 by lighting it up.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic computer having a check function.

[0002]

2. Description of the Related Art Some electronic calculators and other electronic calculators have a check function. This kind of electronic computer stores the key input operation and the calculation result of the first calculation and compares the key input operation and the calculation result of the second time with the key input operation and the calculation result of the first calculation. However, if there is a difference, a warning sound or the like is used to notify the mistake.

[0003]

However, in the above-mentioned conventional electronic computer, since it is judged whether the calculation was correct by comparing the first key input operation and the second key input operation and the calculation result, the number of decimal points below Even if the setting of the digit number specification switch that specifies the number of digits and the rounding switch that specifies whether the last digit of the specified digit is to be rounded off or rounded off is different between the first time and the second time I don't know. Therefore, if the answer is different between the first time and the second time, you must operate the number-of-digits specification switch and the rounding switch to reset the rounding calculation state, and then repeat the second input operation from the beginning. However, there is a problem that the operability is poor.

An object of the present invention is to solve the above-mentioned drawbacks of the prior art and, when the rounding state in the second calculation is different from that in the first calculation, immediately inform the user of the fact and waste it thereafter. An object of the present invention is to provide an electronic computer with good operability that can prevent various key input operations.

[0005]

In order to achieve the above object, an electronic computer of the present invention stores a series of inputted arithmetic expression data, and newly inputted arithmetic expression data and the stored arithmetic expression. In an electronic computer having a verification function for performing verification by comparing with data, an input means for inputting arithmetic expression data, and an arithmetic means for executing arithmetic operation based on the arithmetic expression data input by this input means, Rounding instruction means for instructing rounding of the operation by the operation means, rounding processing means for rounding the operation result by the operation means by the rounding designated by the rounding instruction means, state of the rounding instruction of the rounding instruction means and the input Storage means for storing the arithmetic expression data input by the means in association with each other, newly input arithmetic expression data and the state of the rounding instruction means at that time, and the storage means Detecting means for detecting a match between the stored arithmetic expression data and the rounding instruction state, and notifying when the detecting means detects that at least one of the arithmetic expression data and the rounding instruction state does not match. And a notification means (claim 1).

In the electronic computer of the present invention, the rounding instructing means is a rounding instructing means for designating the calculation result derived by the calculating means by specifying the number of digits, rounding with the number of digits specified, or no designation of the number of digits. It is desirable (claim 2).

The rounding instructing means includes a digit number designating means for designating the number of digits below the decimal point with respect to the calculation result derived by the computing means, and a number of digits below the decimal point designated by the digit number designating means. It is desirable that the rounding instructing means is provided with a rounding-down specifying means for instructing the rounding or rounding of less than or equal to the specified number of digits (claim 3).

The storage means stores the state of the rounding instruction by the rounding instruction means for each operation command data (+,-, x, ÷) included in the operation expression data input by the input means, Each time the detection means inputs the operation command data in the newly input operation expression data, the operation expression data, the state of the rounding instruction means at that time, the operation expression data stored in the storage means, and the rounding instruction It is preferable that the detecting means is a means for detecting a match with the state (claim 4).

Further, it is preferable that the notifying means comprises a display means for blinking and displaying non-matching data (claim 5).

Further, it is preferable that the notifying means is provided with a display means for displaying display data corresponding to the inconsistent data (claim 6).

[0011]

In the electronic computer according to the first aspect, when the arithmetic expression data is inputted by the input means, the arithmetic means executes the arithmetic operation based on the inputted arithmetic expression data.
Then, when the rounding instruction means gives the rounding instruction of the operation by the operation means, the operation result of the operation means is rounded by the rounding processing means by the rounding specified by the rounding instruction means. At this time, the state of the rounding instruction of the rounding instruction means and the arithmetic expression data input by the input means are stored in the storage means in association with each other. Then, the newly input arithmetic expression data, the state of the rounding instruction means at that time, and the coincidence between the arithmetic expression data stored in the storage means and the state of the rounding instruction are detected by the detection means, and the arithmetic expression data or the rounding When it is detected that at least one of the instructed states does not match, the informing means gives an alarm. Therefore, the first time (previous)
After performing the calculation of, when the arithmetic expression data is input again by the input means to perform the second (current) calculation (verification), if the state of the rounding instruction is different from the previous one, the previous data and the current Since it is immediately notified that the data does not match the data of No. 1, it is possible to prevent a useless input operation thereafter.

Further, according to the electronic computer of the second aspect of the present invention, the rounding is performed in any rounding state of the calculation result derived by the calculating means, that is, the number of digits is designated, the number of digits is rounded off, or the number of digits is not designated. Whether to perform the processing can be designated by the rounding instruction means.

According to another aspect of the electronic computer of the present invention, the number of digits below the decimal point of the operation result guided by the operation means is specified by the number-of-digits specifying means, and the operation result is further specified by the number-of-digits specifying means. It is possible to specify whether the rounding process is performed by rounding or rounding the number of digits below the designated number of digits so that the number of digits below the designated decimal point is reached by the truncation designating means.

Further, in the electronic computer according to the present invention, the state of the rounding instruction by the rounding instruction means for each operation instruction data (+,-, x, ÷) included in the operation expression data input by the input means. Is stored in the storage means. And
Every time the operation command data in the newly input operation expression data is input, the operation expression data and the state of the rounding instruction means at that time match the operation expression data stored in the storage means and the state of the rounding instruction. Is detected by the detection means. Therefore, each time new operation instruction data is input, a match between the state of the rounding instruction at that time and the state of the rounding instruction when the operation instruction data was input last time is detected. Done.

Further, according to the electronic computer of the fifth aspect, it is possible to notify the input person that the input operation or the rounding designation state has an error by causing the display means to blink the inconsistent data. At the same time, the input person can be made to recognize what kind of error is made.

Further, according to the electronic computer of the sixth aspect, by displaying the display data corresponding to the inconsistent data on the display means, there is an error in the state of the input operation or the rounding designation. Can be notified to the input person, and the input person can be made aware of what kind of error is made.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the electronic computer of the present invention will be described below.

FIG. 1 is a block diagram showing the basic configuration of the electronic computer of this embodiment.

The electronic computer 1 shown in the figure has a central processing unit (CPU) 2 for controlling the entire computer 1 according to instructions of a program, and a read-only memory (ROM) 3 for storing a microprogram to be processed by the CPU 2.
And a read / write memory (R
AM) 4, a key input unit 5 for inputting data and switching modes described later, a digit number input unit 6 for designating the number of digits below the decimal point, and a digit number input unit 6. A calculation condition input unit 7 for designating rounding or truncation of the last digit of one digit, a display drive circuit 8 and a display unit 9 for displaying numerical data and various message data output from the CPU 2, and CPU 2 It is composed of an amplifier circuit 10 and a speaker 11 for amplifying and outputting a notification sound signal output from.

As shown in FIG. 2, the RAM 4 has a display register area (which also serves as a numeric input register area) 12 for storing data to be displayed on the display section 7, and a CPU.
2 is a calculation register area 13 for temporarily storing a numerical value for calculation, 2 is a memory register area 14 for temporarily storing a calculation result, and a flag for storing various conditions during program execution. Register area 15.

The contents of each flag are as follows. F = 0 Normal operation mode F = 1 Verification mode H = 1 Correction mode H = 0 Correction mode release

The RAM 4 also has a journal memory area 16 for temporarily storing the contents input from the key input section 5,
An area 17 for storing an address pointer Pn for designating each register in the area 16 of the journal memory.

The area 16 of the journal memory is an area 16a of a numerical value memory for storing an input numerical value and an area 16b of a function memory for storing an input arithmetic instruction (+,-, x, ÷, =). , An area 16c of the rounding state memory for storing the rounding state designation data (F, C, 5/4) designated by the calculation condition input section 7 and the digit designation data (4, 2) designated by the digit number input section 6 1, 0, ADD2)
And a region 16d of a digit designation memory for storing Then, every time an input for operation is made from the key input unit 5, numerical data, operation instruction data input immediately after that, and rounding operation state data at that time (rounding state designation data, digit designation data) And are set and sequentially stored in the register of the area 16 of the journal memory designated by the address pointers P0, P1, P2, P3, ....

The key input section 5 is, as shown in FIG.
Numerical key group 1 arranged on the operation surface 18 of the electronic computer 1
9, an operation command key group 20, an instruction key group 21, a memory key group 22, and a verification key 23.

The numerical key group 19 includes numeric keys "0" to "9" for inputting numerical values 0 to 9 and a decimal point key "." For inputting a decimal point.

The arithmetic command key group 20 includes four arithmetic operation command keys “+” for inputting four arithmetic operation commands,
It is composed of "-", "x", "÷" and an equal key "=" for obtaining an answer.

The command key group 21 includes a plus / minus key "+/-" for switching the sign of the displayed numerical value, a percentage key "%" for switching to the percentage calculation, and a previous calculation result in the verification mode. Confirmation key "confirm" to alternately display the calculation result this time, and clear key "C" to correct the mistaken value (register number correction)
And an all clear key “AC” for erasing (initializing) all the operation data up to that point.

The memory key group 22 is a memory plus key "M" for adding the displayed numerical value to the numerical value stored in the memory register (inputting a positive numerical value).
+], A memory minus key "M-" for subtraction (input with a negative numerical value), a memory recall key "MR" for recalling the numerical value stored in the memory register, and a memory recall key stored in the memory register. It consists of the memory recall clear key "MC" for recalling the numerical value and deleting the memory contents at the same time.

The verification key "verification" 23 is an instruction key for alternately switching between the standard calculation mode and the verification mode.

Further, on the operation surface 18 of the electronic computer 1, a decimal point designating switch 26 which is an operation portion of the digit number input portion 6 is provided.
And a rounding switch 2 which is an operation unit of the calculation condition input unit 7
And 5 are provided.

The rounding switch 25 is a switch for designating how to process the decimal point. The round mode switch 25 is a free mode "F" for freely obtaining the decimal point and the digit specified by the decimal point designating switch 26. It is possible to specify either a cut mode "C" that cuts off the last 1 digit or a rounding mode "5/4" that rounds off.

In the decimal point designating switch 26, the rounding switch 25 has a cut mode "C" or a rounding mode "5 /
Switch effective when 4 "is specified, 0 digit mode" 0 "that does not require decimal places, 1 digit mode" 1 "that requires 1 digit after decimal point, 2 digit mode that requires 2 digits after decimal point" You can specify either 2 "or a 4 digit mode" 4 "that requires up to 4 digits after the decimal point. The decimal point designation switch 26 automatically inserts a decimal point in the second digit without pressing the". "Key. It is also possible to specify the fixed point mode "ADD2".

The display section 7 is composed of a well-known liquid crystal display, and when the numerical data and various message data output from the CPU 2 are input to the display drive circuit 6, the display drive circuit 6 drives the numerical data. As shown in FIG. 9, the display window 9a displays numerical data such as numbers and answers and various message data.

The display window 9a is provided on the operation surface 1 as shown in FIG.
It is provided above the 8 input keys. This display window 9a
Can display up to 8 digits. On the left side of the numerical display area, "M" is displayed when the memory register of RAM4 contains a numerical value, "K" is displayed during constant calculation, and "E" is displayed when there is an input error such as dividing a certain number by zero. But they are designed to light up respectively.

The upper area of the numerical value display area is a message display area such as "during verification", "OK", "previous time", "current time", "rounding", etc. when in the verification mode. "In check" is "OK" when the calculation was correct as a result of the check, and "Previous" is the current (check mode) when the displayed value is the previous (normal calculation mode) value. When "is", the decimal point designation switch 2
When the settings of 6 and the round switch 25 are different from those of the previous calculation, the "rounding" is turned on.

Further, in the upper left corner of the display window 9a, the symbols (+,-, ×, ÷, =) of the operation command inputted after the numerical value displayed in the display window 9a during the verification are displayed. A calculation symbol display unit 24 for displaying is provided.

Next, the operation of the electronic computer 1 having the above configuration will be described with reference to the flow charts of FIGS. 4 to 8 and FIG.

After the "AC" key is pressed, the key input section 5
When data is input from F, first, F = 0 in the numerical key / function key processing routine (FIGS. 4 and 5).
Whether or not, that is, the normal calculation mode or the verification mode is determined (step S1).

Then, when F = 0, it is judged whether or not the input data is the input data by the numeric key (step S2). In the case of the numeric key, the numerical value is displayed in the display register 12. Is simultaneously stored in the display window 9a and is displayed (step S3). By repeating the input operation using the numeric keypad any number of times, a numeric value of any digit (up to eight digits) is displayed in the display window 9a.

Then, when the four arithmetic operation instruction keys such as "+" and "-" are operated, the input numerical data (5, 6, 3, 2.1, etc.) and the operation instruction data ( +, −, ×, ÷), rounding state designation data (F, C, 5/4) at that time, and digit designation data (4, 2, 1,
0, ADD2) is the address pointer Pn (initially Pn =
Stored in the register number memory area 16a of the journal memory area 16 designated by PO), the function memory area 16b, the rounding state memory area 16c, and the digit designation memory area 16d (step S4). ). Each time this arithmetic operation is repeated, the address pointer Pn successively becomes the next address designation Pn + 1 (step S5), and calculation processing and calculation result display are performed one after another (step S6). Then, when the "=" key is operated, the answer is displayed in the display window 9a.

Next, when the "verification" key 23 is operated,
The verification key processing routine (FIG. 6) is executed, and “verifying” is first displayed in the message display area of the display window 9a (step S17), and after the address pointer Pn becomes the initial address designation P0, Flag F is F =
1, that is, the verification mode (steps S9 and S1)
0).

Further, when the "verification" key 23 is operated in the verification mode, the display of "during verification" is erased (step S11), and the normal operation mode is restored (step S12).

In the verification mode, first, in the numerical key / function key processing routine (FIGS. 4 and 5), H =
It is determined whether or not 0, that is, whether or not the correction mode is set (step S13).

When data is input from the key input section 5 when H = 0, it is determined whether or not the input data is input data by the numeric key (step S1).
4) In case of numeric key, the value is displayed in register 1
No. 2 is stored and displayed on the display window 9a at the same time (step S15). By repeating the input operation using the numeric keypad any number of times, the number of values of any digit (however, up to 8 digits) is displayed in the display window 9a.

Next, when the operation command key is operated, the input current numerical value / operation command / rounding operation status data and the area 16 of the journal memory designated by Pn.
The previous numerical value / arithmetic instruction / rounding arithmetic state data stored in the register is compared (step S16).

If the present numerical value / arithmetic instruction / rounding arithmetic status data and the numerical value / arithmetic instruction / rounding arithmetic status data stored in the area 16 of the journal memory match, the address pointer Pn sequentially becomes the next address designation Pn + 1 (step S17), and calculation processing and calculation result display processing are performed (step S1).
8).

Each time the operation of the numeric key and the operation command key is repeated, the input numerical value / operation command / rounding operation status data and the registers in the area 16 of the journal memory designated by Pn are stored. The numerical values / arithmetic instructions / rounding arithmetic status data are compared one after another, and if they match, calculation processing and calculation result display processing are performed one after another (steps S16 to S18).

When the "=" key is operated, the calculation is terminated (S19), and "OK" indicating that the calculation was correct is displayed in the message display area of the display window 9a (step S20).

Further, the inputted numerical value / arithmetic instruction / rounding arithmetic state data and the previous numerical value / arithmetic instruction / rounding arithmetic state data stored in the register of the area 16 of the journal memory designated by Pn are combined. If not, an alarm sound is emitted from the speaker 9 (step S21), and the unmatched data is blinked and displayed on the display window 9a (step S22).

Thereafter, the flag H becomes H = 1, that is, the correction mode is set (step S23), and "this time" is displayed in the message display area of the display window 9a (step S2).
4).

In the correction mode, when the "confirm" key is pressed, the "confirm" key processing routine (FIG. 7) is executed.
The operation of the "confirm" key is valid only when the flag F is F = 1 (verification mode) and the flag H is H = 1 (correction mode). Every time the "confirm" key is pressed, the previous input is performed. The displayed numerical value and arithmetic command symbol and the numerical value and arithmetic command symbol input this time are displayed alternately, and the "previous" and "current" display bodies are displayed alternately (steps S25 to S27).

When the same correct input as the previous time is input by the numeric key and the same correct input as the previous time is input by the operation command key (steps S28 and S29), the flag H becomes H = 0, and the correction mode is set. Is terminated (step S30).

After the above correction processing, after the address pointer Pn becomes the next address designation Pn + 1 (step S3).
1), calculation processing and calculation result display processing are performed (step S32). After that, through the same processing as the steps S13 to S18, all the numerical values / calculation instructions /
When the rounding operation state data match, when the "=" key is operated (step S20), "OK" is displayed in the message display area of the display window 9a (step S2).
4).

When the "AC" key is pressed, "A"
After the "C" key processing routine (FIG. 8) is executed to erase all the normal calculation data and verification data (step S33), the address pointer Pn returns to the initial address designation P0 (step S34), and the normal calculation is performed. The input waits for.

FIG. 9 shows an example of setting states of the rounding switch 25 and the decimal point designating switch 26, an example of key operation in the key input section 5, and an example of display of the display window 9a at that time. . In the figure, (a) to (c) are calculation examples in the normal calculation mode, and (d) to (g) are calculation examples in the verification mode performed after the operations of (a) to (c).

In (a), with the rounding switch 25 set to the free mode "F" and the decimal point designating switch 26 set to the 2-digit mode "2", the "5" key, the "+" key, and the "6" key are set. As a result of sequentially operating the key and the "÷" key, the calculated value "11" is displayed on the display window 9a. Further, the operation symbol display portion 24 of the display window 9a is operated last at this time. The calculation symbol "÷" of the calculation command key is displayed.

In (b), after the rounding switch 25 is switched to the cut mode "C", the "3" key and the "÷" key are operated in sequence following the operation of (a), resulting in 2 decimal places. The calculated value "3.66" and the operation code "÷", which are rounded down to the nearest whole number, are displayed.

In (c), the rounding switch 25 is switched to the rounding mode "5/4" and the decimal point designating switch 26 is switched to the one-digit mode "1", and the operation of (b) is followed by the "2" key. , "." Key, "1" key are operated in sequence, and finally "=" key is operated, so that the numerical value "1.7" indicating the calculation result is displayed (above, the step S1 to S6).

In (d), the operation of the "verification" key 23 causes the display of "verifying" to light up in the message display area of the display window 9a (steps S7, S above).
8) After that, the same "5" key, "+" key,
As a result of sequentially operating the "6" key and the "÷" key, the calculated value "11" is displayed (steps S13 and S1 above).
4, S16-S18).

In (e), the rounding switch 25 is set to the same cut mode "C" as the previous time, but since the decimal point designating switch 26 is set to the one digit mode "1" different from the previous time, When the "3" key is operated and the "÷" key is further operated after the operation of d),
A loud beeping sound is temporarily emitted from the speaker 9 and the "rounded" display is blinkingly displayed in the message display area of the display window 9a (steps S16 and S2).
1, S22). In this way, when an arithmetic operation is performed in a rounding calculation state different from the previous time, an alarm sound is emitted, and a display body indicating the content of the erroneous operation is displayed in a blinking manner to indicate that the rounding calculation state is specified incorrectly. You can immediately notify the input person.

In (f), the decimal point designating switch 2
The correct calculated value "3.66" is displayed because 6 was reset to the same 2-digit mode "2" as the previous time.

In (g), after changing the rounding switch 25 to the same rounding mode "5/4" as the previous time and the decimal point designating switch 26 to the same one digit mode "1" as the previous time, the operation of (f) is performed. Next, the same key operation as the previous time was performed up to the "2" key and the "." Key, but the number key "2" key different from the last time was operated, so that the "=" key was operated Then, the alarm sound “pi-pi” is temporarily emitted from the speaker 9, the numerically input value “2.2” which is erroneously input this time is displayed blinking on the display window 9a, and “this time” is displayed in the message display area. The body is displayed (steps S16, S21 to S24).

As described above, by blinking the data that does not match the previous data in the display window 9a, the input person can be surely notified that there is an error in the input operation or the designation of the rounding calculation state. Moreover, the input person can be made to recognize what kind of error was made.

Further, in the electronic computer 1 of this embodiment, by pressing the "confirm" key, the previous numerical value and arithmetic instruction data and the present numerical value and arithmetic instruction data are displayed on the display window 9a.
Since it can be displayed alternately, the previous input value can be confirmed on the display window 9a and the error can be immediately corrected.

The computer of the present invention is not limited to the configuration of the above embodiment. For example, in the above-described embodiment, the decimal point designating switch 26 for designating how many digits to the right of the decimal point are calculated, and the rounding for designating whether to round down or round off the last one digit designated by the decimal point designating switch 26. The case where the switch 25 is provided has been described, but in the case of a model in which the number of digits is fixed so as to obtain a fixed number of digits below the decimal point, the decimal point designation switch 2
It goes without saying that 6 is unnecessary.

In the above embodiment, the previous input value and the current input value can be displayed alternately by pressing the "confirm" key. However, if there is an erroneous input during verification,
The previous input value and the current input value may be automatically displayed alternately at regular intervals.

[0067]

In summary, according to the present invention, the following excellent effects can be exhibited.

According to the electronic computer of the first aspect, when the arithmetic expression data is input and the arithmetic operation is performed, when the arithmetic expression data is input again for verification, the input operation or the rounding state is different from the previous time. If so, the previous data and this time data will not be matched and will be notified immediately, so
It is possible to prevent unnecessary input operations thereafter and improve operability.

Further, according to the electronic computer of the second aspect, the calculation result derived by the calculation means is rounded in any rounding state of digit number designation, rounding with digit number designation, and no digit number designation. You can specify whether to process.

According to the electronic computer of the third aspect, the number of digits below the decimal point of the operation result derived by the operation means is designated, and the number of digits below the designated digit is either rounded down or rounded down. You can specify whether to perform the rounding process in the rounded state.

According to the electronic computer of the fourth aspect, the state of the rounding instruction at each new input of the operation instruction data and the rounding when the operation instruction data was input last time A match with the state of the instruction is detected,
When they do not match, a notification is given immediately, so that useless input operation thereafter can be prevented and operability can be improved.

Further, according to the electronic computer of the fifth aspect, it is possible to notify the input person that the input operation or the rounding designation state has an error by causing the display means to blink the inconsistent data. At the same time, the input person can be made to recognize what kind of error is made.

Further, according to the electronic computer of the sixth aspect, by displaying the display data corresponding to the inconsistent data on the display means, there is an error in the state of the input operation or the rounding designation. Can be notified to the input person, and the input person can be made aware of what kind of error is made.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a configuration of a memory area of the electronic computer of the above embodiment.

FIG. 3 is a plan view showing the external appearance of the electronic computer of the above embodiment.

FIG. 4 is a flowchart (numerical key / function key processing routine) for explaining the operation of the electronic computer of the above embodiment.

FIG. 5 is a flowchart (numerical key / function key processing routine) for explaining the operation of the electronic computer of the above embodiment.

FIG. 6 is a flowchart (verification key processing routine) for explaining the operation of the electronic computer of the above embodiment.

FIG. 7 is a flowchart (“confirmation” key processing routine) for explaining the operation of the electronic computer of the above embodiment.

FIG. 8 is a flowchart (“AC” key processing routine) for explaining the operation of the electronic computer of the above embodiment.

FIG. 9 is a diagram showing an example of setting states of the rounding switch and the decimal point designating switch of the computer of the above embodiment, an example of key operation in the key input section, and an example of display of the display window at that time. is there.

[Explanation of symbols]

1 electronic computer 2 central processing unit (CPU, calculation means, rounding processing means, detection means, notification means) 3 read only memory (ROM, storage means) 4 occasional write / read memory (RAM) 5 key input section (input means) 6 Digit Number Input Section 7 Calculation Condition Input Section 8 Display Drive Circuit 9 Display Section (Display Means, Notification Means) 9a Display Window (Display Means) 10 Amplifier Circuit 11 Speaker (Notification Means) 12 Display Register Area (Numerical Input Register 13 area of operation register 16 area of journal memory (storing means) 18 operation surface 19 numeric key group 20 operation instruction key group 21 instruction key group 23 verification key 24 operation symbol display section 25 rounding switch (rounding instruction means) , Rounding down specifying means) 26 Decimal point specifying switch (rounding indicating means, digit number specifying means)

Claims (6)

[Claims] 1. A series of input arithmetic expression data is stored,
In an electronic computer having a verification function for performing verification by comparing newly input arithmetic expression data with the stored arithmetic expression data, an input means for inputting arithmetic expression data, and an input means for inputting the arithmetic expression data And a rounding instruction means for instructing the rounding of the operation by the operation means, and a rounding process for rounding the operation result by the operation means by the rounding designated by the rounding instruction means. Means, storage means for storing the rounding instruction state of the rounding instruction means and the arithmetic expression data input by the input means in association with each other, newly input arithmetic expression data and the state of the rounding instruction means at that time And detecting means for detecting a match between the arithmetic expression data stored in the storage means and the state of the rounding instruction, and the detecting means for calculating the arithmetic expression data or An electronic calculator comprising: a notification unit that notifies when at least one of the rounding instruction states is not matched. 2. The rounding instructing means is a rounding instructing means for designating a digit number designation, rounding with digit number designation, or no digit number designation for the calculation result derived by the calculation means. The electronic computer according to claim 1. 3. The rounding instructing means includes a digit number designating means for designating the number of digits below the decimal point with respect to the calculation result derived by the computing means, and a number of digits below the decimal point designated by the digit number designating means. 2. The computer according to claim 1, which is a rounding instructing means including a rounding-down specifying means for instructing a rounding down or a rounding down of the number of digits designated as below. 4. The storage means stores arithmetic command data (+, −,) included in arithmetic expression data input by the input means.
X, ÷) stores the state of the rounding instruction by the rounding instruction means, and the detecting means stores the arithmetic expression data and the rounding instruction at that time each time the operation instruction data in the newly input arithmetic expression data is input. 4. The electronic computer according to claim 1, 2 or 3, which is a detection unit that detects a match between the state of the means and the state of the rounding instruction and the arithmetic expression data stored in the storage unit. 5. The informing means comprises display means for blinking display of inconsistent data.
Electronic calculator as described. 6. The electronic computer according to claim 1, wherein said notifying means comprises display means for displaying display data corresponding to data that does not match.