JPH10283326A - Desk-top calculator having display device with plural line in which confirmation and correction of input is made easy - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make this device easier to understand and more convenient to use than the present one by allowing a user to know the input miss of a desk-top calculator, to calculate a correct answer by replacing only the part of the input miss, and to understand an operation process. SOLUTION: A display device is provided with plural lines, an inputted operation is successively displayed, and the operation is stored in a storage device so that an arithmetic operation can be performed in a batch. The arithmetic result is similarly stored, and the stored content is arbitrarily displayed so that the input can be confirmed. The number of items is added to the input so that the present number of inputs can be recognized. At the time of correction, when a line to be corrected is displayed, the correction can be attained by replacing the numeric number by the input which is the same as usual. At that time, the arithmetic result is changed. It is possible to check the accounts by inputting the same arithmetic operation twice. Then, a wrong input part can be understandably displayed by adding the number of items to the plural lines. At that time, a correct answer can be calculated by selecting the correct input.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in the function of an office desk electronic computer.

[0002]

2. Description of the Related Art Desk-top electronic calculators (hereinafter referred to as calculators) are widely and generally used. Basic office equipment. Since development
Improvements have been made, such as combining a clock and providing a key for exclusive use of tax calculation. However, improvements in basic functions of general-purpose models such as the present invention have not been found. Some models have a check function that stores the first input to confirm the input and compares it with the second input. Because there is no concept of item,
If the first and second input items were different, the calculation would be redone from the beginning, and the display would not be easy to understand because the display was one line.

[0003]

[Problems to be solved by the invention] Conventional calculators only display calculation results, so there is no way to know whether the calculation results are correct or not, except to calculate again. For those who can't use a calculator, it's a great pain. In addition, the user who has used the calculator repeats the same calculation twice for the above-mentioned reason, and performs the check work. At this time you have to write down the first answer. If the answer is wrong, you have to start over again.

[0004] Conventional calculators calculate sequentially, so mathematically correct "priority calculation of multiplication and division" cannot be performed. To perform mixed calculations of multiplication and addition, you must use the memory function. The memory function is not unified depending on the model, and some seem to be difficult to use. The calculation cannot be interrupted during the calculation. The number of input items is unknown. As you can see, the conventional calculator seems to have many problems.

[0005]

According to the present invention, a storage device for storing a considerable number of inputs is prepared, and an operator and a numerical value are stored and provided so as to be sequentially displayed on a plurality of rows of display devices. Perform the operation collectively using the stored operator and numerical value,
A device has been set up for priority calculation of multiplication and division.

[0006] The input can be confirmed by moving the display position of the stored input and the operation result by the up and down keys, and when there is an input error, when the line is displayed, the input is re-displayed. By inputting, the device can be modified. By displaying the item number before the input display, the number of input items can be known.

By inputting the same calculation formula twice and pressing the [OK] key, the first and second calculation inputs are compared with the calculation results, and the different input parts are displayed in multiple lines with item line numbers. The device is displayed clearly so that you can select the correct input. The device is designed so that the input and the operation result in the memory can be referred to. The independent memory used in the conventional calculator can be used, and the device can be used to calculate constants using the memory.

[0008]

FIG. 1 shows an example of a front view of the present invention. A 10-digit calculator with a 5-line display.
The number of displayed lines is not particularly limited as long as it is 4 lines or more including the check display. Considering the actual use and grasping the display information, the larger the number, the better it is not.
Considering the size of the device, the number of lines is 5 lines. The purpose of the present invention is to improve the function of the calculator, but we have devised that the operation will not be complicated as the function is improved. This is almost the same usage as a conventional calculator. It is a display of 5 lines, but the number where the number is input when actually operating is only the 5th line and the first line is 4
Use only for display up to the line. The first to fourth lines are collectively referred to as "auxiliary lines".

Putting a number on the fifth line is the same as a conventional calculator. ("0." is displayed at the right end, and when you press a number key, it shifts to that number, and when you press it further, it shifts to the left.) The fifth line is referred to as "operation line" hereinafter. If you use the same as a conventional calculator, the operation line will always be the latest input line. This case will be referred to as “memory row adding operation”. The display can be moved to confirm and correct past inputs and calculation results, so the operation line and the latest input line may not match. This case will be referred to as “moving display” hereinafter. In this embodiment, the operation memory and registers are allocated on the RAM connected to the arithmetic unit, and the operation of each part is realized by software. The following symbols are used at the end of each storage device expression. The register that handles numerical values is "LR" (long register, the content of which will be described later). 0 to 255 in 8 bits
The register that represents the value of "R" (register). O
A memory (flag) that represents the state of N or OFF as “F”.

Display device FIG. 2 shows a case where the display device is fully lit. The display of one line is initially a two-digit number of items, a 5 × 5 dot structure representing an operator, a minus display for errors and 10-digit numbers, 10
A five-line display with one digit consisting of a digit and a decimal point in each digit, and a digit break point in the third and higher digits, and a display in which numbers are stored in memory at the bottom line "M" A display that allows constant calculations "K" Check result display "ERR""CHK""CheckOK" Display moving display (indicating that there is a line that can be displayed at the bottom) The black lower triangle mark is displayed.

Internal Representation of Numerical Values A 10-digit floating-point numeric value is internally composed of three parts: 10 numeric characters, a decimal digit indicating the position of the decimal point, and a positive / negative flag indicating positive / negative. Hereinafter, all the storage devices that indicate LR have this configuration. Numeric character is "0"
There are 11 types of characters, including the characters “～” and the space “□”.
These are 10 characters long and are arranged as displayed on the display. The minimum value is 0. In this case, only the last of the 10 characters is a "0" character, and the first to ninth characters are blank. The decimal places indicate the position of the decimal point. Values are between 0 and 9. The positive / negative flag takes a value of "+" or "-". Represents the sign of a number.

Structure of Memory Row The present invention is characterized by storing operation and calculation results. Operations and calculation results are written and stored in memory rows one by one. The structure of one memory line is composed of four parts: number of items, operator, error expression, and numerical value. The number of items is a sequential number representing the input item. There are the following six types of operators. "]" Operation starts, the calculation starts from the line where the operator is this symbol. “+”, “−”, “×”, “÷” Mathematical four arithmetic operations. It is as expressed. "=" Equal, the line of calculation result display. The error expression is a flag that uses only the line where the operator is "=". Numeric values are structured as described in Internal representation of numbers. In the present invention, 256 sets of the above storage rows are used for storage. The software may operate the memory row specified by the register. In that case, it is expressed as a numerical value (specified R), an operator (specified R), and the number of items (specified R). The meaning is "the numerical value of the storage line indicated by the specified R", "the operator of the storage line indicated by the specified R", and "the number of items in the storage line indicated by the specified R".

FIG. 3 shows an example of the storage state of a storage row in response to an operation.
The memory row is continuous from row 0 to 255, but conceptually, think of it as connecting to row 0 after row 255 and row 255 before row 0. Actually, the designation of the memory row is done by an 8-bit register, so if 256 rows were used, it was necessary and sufficient, and the process related to row consolidation could be omitted. Two dedicated registers are used to manage the writing to the memory line. Names are "Start R" and "Input R". Starting R indicates the oldest valid memory line. Input R indicates the most recent memory row. A valid memory row is added with the operation, and the value of input R increases by one. The line is determined by the operator of that line.

In describing a memory row, the concept of a "group" of several consecutive memory rows is used. See Figure 3. One group is a unit of calculation, and the contents are from the line of "]" (start of calculation) to the line of "=" before the next line of "]", or the line indicated by input R. The number of items is always "01" at the beginning of the group. Use a dedicated register to write the number of items. Name it "Item R". For the number of items, set “01” in item R and write to that line when the group starts with “]”. When the four arithmetic operations are performed, the value added by 1 is written, and after the line feed operation, it is written to the line. Write the same value as the previous line in the "=" line. Values range from 01 to 99. You need to determine the maximum number of items that can be calculated due to the structure of the batch calculation.
If 99, it is necessary and sufficient considering the usage of the calculator, and the display can be done with 2 digits, so 99 was adopted. If you input more than 99 lines, a new group is created with "=" and "]" lines. The number of items loses consistency when the operator is once pressed the "=" key after inputting it, or when insertion correction or deletion correction is performed after post-verification, so it is newly written in the calculation subroutine. You. If input continues and the value of input R becomes the same as the start R, the start R is moved to the beginning of the next group. With this action, you have destroyed the oldest group. By performing this operation, different calculations can be executed one after another without clearing all.

Configuration related to input As shown in Fig. 1, there are 27 keys used for input. In the embodiment, key scanning is performed by software. Prepare a register to determine which key was pressed. Name it "Key R". The content is a key number from 1 to 27 corresponding to the pressed key.
The following shows the correspondence between keys and numbers. Key R0 is when no key is pressed. Numeric keys “0” to “9” “.” “00” 12 keys R 1 to 10 11 12 Correction-related keys Digit correction keys “C” “AC” 3 keys R 13 14 15 Memory-related keys “MR” “ MS, “K” 3 keys R 16 17 18 Display movement relation key “TP” Up key Down key 3 keys R 19 20 21 Recalculation relation “Check” 1 key R 22 Calculation relation key “+” “−” “ × ”“ ÷ ”“ = ”5 keys R 23 24 25 26 27 During the memory line addition operation, the line feed operation is controlled by the operation key. Use flags to know the current state. Name it "Line feed F".

Explanation of the register for inputting numbers Since the input method is the same as that of the conventional calculator, a numerical value, an operator, a numerical value, an operator, a numerical value. . The calculation result is displayed by inputting equal. At this time, the operator writes directly to the operation storage memory, but for the numerical value, a special register for numerical value input is provided in consideration of validity verification, input during display movement, etc. Name it "Operation LR". The content is a numerical representation. As a special mechanism, the numeric characters can be shifted left and right. When shifting to the right, leading blanks are inserted. Use flags to control decimal input. Name it "Decimal F". Numeric key input is always written to the operation LR once. Make sure that "0" does not precede the numeric characters when writing to the operation LR. When copying to the memory line, if there is a decimal digit and the last of the decimal part is "0", it is cut off.

Displaying lines Display is a display that is written by writing to the display memory of the display device. The display is controlled on a line-by-line basis. Specifically, the memory row to be displayed, the display destination, and the display control are specified to a specific register, and the display write routine is called to write the data to the display holding memory according to the contents. Only for the operation line, the operation LR may be displayed in the numerical display. Registers used for communication with the display routine are named "D line R", "D mode R" and "D display line R". The D display row R is actually written out. Lines 1 to 5 D mode R is for display control. The contents are as follows. "0" usually writes out the contents of the line. The entire "1" line is turned off. Only "2" item number display is off, operator is used for "=" line. "3" The display of the numerical value part is the content of the operation LR. D line R is the storage line to be displayed. The display of one line matches the contents of the storage line with the number of items "01" to "99", operator, error expression, and 10-digit floating-point numerical value. The position of the decimal point is calculated based on the number of decimal digits and the length of the numeric characters. Negative numbers are represented by displaying "-" at the left end of the number. We adopted this format to avoid confusion with operators.

Auxiliary line display A special register is used to indicate which part of the memory line is to be displayed. Name it "Display R". When the display R is equal to the input R, the memory line is being added. Display R
When the input R is not equal, the display is moving. A flag is used to distinguish the above operations, and the name is "Move F". FIG. 1 shows the display R in the storage example of FIG.
Is an example of a value of 245. The memory row indicated by display R is the one displayed on the operation row. Conversely, if the contents of display R are changed, the display will move. The contents of the display R can be changed with the up / down key, “TP” key, “=” key, etc. The value is limited to the range from start R to input R. FIG. 4 is a display example when the display R is each value in the storage example of FIG. The auxiliary line displays four consecutive lines before the operation line. However, since the memory line before the start R is invalid, it is turned off so that it is not displayed. See the top diagram in FIG.

Display of operation lines There are two types of display of operation lines: during input and display of stored contents. During numerical input, the contents of the operation LR are displayed. While the display is moving to confirm the calculation result or input, the memory row indicated by display R will be displayed. A flag is provided to determine whether data is being input or displayed. Name it "Operation F". When the operation F is set, the number of items and the operator depend on the contents of the memory row indicated by the display R, but the numerical value indicates the operation LR. See the bottom diagram in FIG. In the case of FIG. 4, the contents of the memory row are undefined, but the display of the operation LR is "0." because the numerical value of the operation LR is "0.", and is written into the operation LR by inputting a numeric key. When more than 15 keys are operated with the contents of key R, copy to memory line.

Arithmetic registers The three arithmetic registers are used, and the contents are numerical expressions. The names are "A calculation LR", "B calculation LR", and "C calculation LR". The flag is used to determine when the operation results in an error. Name it "Error F".
A operation LR is for basic operation. The B operation LR is reserved for performing a priority operation of multiplication and division. C operation LR is for copying numerical values from operation memory. The calculation is performed by BCD calculation. The software is installed so that the following calculation can be performed. The lower part exceeding 10 digits is truncated. The registers used for calculation are omitted. Multiplication A calculation LR * C calculation LR → A calculation LR Division A calculation LR / C calculation LR → A calculation LR Addition B calculation LR + A calculation LR → A calculation LR Subtraction B calculation LR-A calculation LR → A calculation LR Calculation result If error exceeds 10 digits, set error F,
Move the decimal point of the contents of "A operation LR" and "C operation LR" to a position exceeding 10 digits so that an approximate calculation can be obtained. Error F is also set when division by a negative number or 0 is performed.

Concept of calculation The calculation is not performed for each input, but is performed collectively after a specific operation according to the memory input. Use flags to control operations. Name it "Operation F". All calculations are performed on a group basis. First, find the beginning of the group you are working on. To find the beginning of the group being operated, a special register is provided to know the current operation line. Name it "Operation R". When calculation F is set, display R is copied to calculation R. The operator is checked forward from the line indicated by the operation R, and "]"
Find the line The operation is performed until the next [] line appears or the line indicated by the input R. To perform multiplication and division priority operations, rows with an operator of "+" or "-" are held without operation until the next line of "+" or "-" or "=" To do. A operation LR is shown in the line of "="
Copy the contents of At this time, if the error F is set, the error expression of the memory row is set. Rewrite the number of items using item R in the loop.

Memory function concept In conventional calculators, memory was an independent entity. However, in this embodiment, the input numerical value and the operation result numerical value are stored in a considerable number, so that the numerical values can be referred to. Specifically, display the numerical value you want to refer to the operation line by moving the display,
By operating the "MR" key, the numerical value is copied to the latest input line, and the display is returned to the latest input line. A stand-alone memory is also frequently used, so one is provided. Most of the conventional calculators can execute a constant operation by operating the same operation key twice, but in this embodiment, it is difficult to display multiple displays easily with the same operation, so combining with an independent memory, A key is provided to perform constant operation. Use number registers and operator storage registers for independent memory. Names are "M numerical value LR" and "M operation R".

The concept of reconciliation The reconciliation is performed by comparing groups on a line-by-line basis. The group to which the input R belongs and the previous group are compared in units of rows. If the contents of the line match up to the end of the group, there is no input mistake and the contents of the group are exactly the same. Therefore, the group to which the line indicated by the input R belongs is discarded, and "Check OK" is displayed. If the contents of the rows do not match on the way, "CHK" is displayed, and each row that did not match and the final calculation result of each group are displayed. Figure 5 shows an operation example and display example when the contents do not match in the verification. After "CHK" is displayed, select the correct input with the up and down keys to replace that line and perform the check from the beginning until "Check OK" is displayed.
By performing the selection operation, the correct operation result can be obtained. If you do not understand the contents of the "CHK" display,
Return to normal display by operating "TP" key and "=" key,
You can read each line one by one.

If the number of items is the same, only the above processing is sufficient, but see FIG. The following is an example of the operation for input error. The first input is correct, and the second is skipping 04 and 05 inputs with the number of items in the first. In this case, even if you select the correct input, only the above processing will not result in the display of "Check OK" because the number of items is different. In order to cope with such a case, display "CHK" once, and then check if there is a single line that did not match if the number of items in the group was different. Compares unmatched rows in groups with fewer items and unmatched rows in groups with more items to the end of the group, starting with the row with the difference in items. In this case, the values in the equal lines are not compared. In the example of FIG.
06 obtained by adding the item difference 2 to the row 04 that did not match the second time
Compare the row with the second row from 04. If there is a match up to the end of the group, the unmatched rows of the group with a large number of items are single data, so the unmatched rows of the group with a small number of items in the "CHK" display are turned off.

In the example of FIG. 6, two of 04 and 05 are independent data. When a group with a large number of items is selected by the selection operation, the storage lines of the group with a small number of items are shifted by one line at the end, and the unmatched lines of the group with a large number of items are inserted and the calculation is performed from the beginning. . When a group with a small number of items is selected by the selection operation, the storage rows of the group with a large number of items are shifted forward by one line, and the unmatched rows of the group with a large number of items are deleted and recalculated from the beginning. . By performing the above operation, most input errors can be handled. Fig. 7 shows an example of the display until a correct operation result is obtained by performing a different wrong input and selection action. After selecting the input intuitively, it was decided that it would be better to display "Check OK", so this format was used.

When the memory is not in a format that can be checked, "ERR" is displayed. Use registers to interact with the display. The name will be “Check R”. Checking R
Is as follows: "0" No verification is performed. No verification related information is displayed. "1" is not in the form of verification, "ERR" is displayed. "2" Displayed "Check OK", which matches the check result. "3" Display the check check "CHK" with the same number of items. "4" Check check with many first group items "C
HK ”display. "5" Check check with many items in the second group "C"
HK ”display. Uses six working registers for reconciliation work. Names are "Detection 1R" to "Detection 6R".

Summary of Registers and Flags Registers and flags described so far are described collectively by type. Memory line Item () Operator () Numeric value () (Error expression is written when writing numerical value) 256 sets from 0 to 255 Numeric value register Contents 10-digit floating-point numeric value expression A operation LR, B operation LR, C operation LR, operation LR, M number LR 5 management registers Contents 0-255 Start R, input R, display R, item R, calculation R, check R, key R, M calculation R, check 1R to check 6R display 14 Control contents 0 to 255 D row R, D display row R, D mode R 3 flags Move F, line feed F, operation F, calculation F, decimal F, error F 6

FIG. 8 shows a flowchart of the entire control. The whole is an infinite loop. Loop 1 Performs the operation if it is set by looking at operation F.
Reset calculation F. Clear operation LR.
Call the routine that displays the auxiliary line. Loop 2 Displays the operation line. Loop 3 Wait until the key is released during key input check. It stops until there is a key input in the key input check. Key R
If the value is 15 or more and the operation F is ON, the contents of the operation LR are written in the memory row indicated by the display R, and the operation F is set to OFF. Jump to the processing routine for each key corresponding to key R. To rewrite the entire display, loop 1
I will return to When rewriting only the operation line like numeric keys and correction keys, return to loop 2. If the key is not accepted, return to loop 3.

Software subroutine Some operations are summarized as subroutines. Operation subroutine FIG. 9 is a detailed flowchart. See the concept of operation.

Auxiliary line display subroutine FIG. 10 shows a detailed flowchart. See Displaying supplementary rows. To display the bottom line, call the bottom line display subroutine.

Bottom line display subroutine FIG. 11 shows a detailed flowchart. M number LR,
The bottom line is displayed according to the contents of M operation R, verification R, and movement F.

Item R Addition Subroutine FIG. 12 shows a detailed flowchart. Item R is 10
In order to forcibly perform grouping when it becomes 0. Check item R and if it is 100, insert two rows of "=" once,
After performing the operation, change the operator on the second line to "]" to forcibly perform grouping. Call the input R addition routine.

Input R Addition Subroutine FIG. 13 shows a detailed flowchart. To perform the work of discarding the old group when it becomes equal to the start R. If the input R and the start R are the same, move the start R until the next [] appears.

Forward Shift Subroutine FIG. 15 shows a detailed flowchart. Shift the storage line forward to change the contents after the check with a different number of items. If you delete the "]" line, change the operator on the next line to "]" to maintain group consistency.

Rear Shift Subroutine FIG. 16 shows a detailed flowchart. Shift the storage line backward to change the content after the check with different number of items. If the "]" line moves, change the operator to "+" to maintain group consistency.

Processing routine when each key is pressed "Numerical key" FIG. 17 is a detailed flowchart.
Fig. 14 shows the detailed flow chart of the "00" key. Set operation F to display the operation line. Put numbers on the operation line. When the operation line is displaying the answer as if it were equal, advance the display one line and put the number. At this time, the operator is []]. Next, set a line feed F so that a new line is input when another key is operated. During the display movement, the contents of the operation line are replaced from the beginning. (Excluding the equal line) At this time, the value of the display line and the
Set. Fig. 14 shows the detailed flow chart of the "00" key.

[Four arithmetic keys] FIG. 18 shows a detailed flowchart. If line feed F is set, line feed operation is performed. Reset line feed F. Writes the entered operator and item R to the storage line. Set operation F to display operation LR. The operation during display movement resets the operator of the memory line indicated by the current display R. (Except the equal line)

[= Key] FIG. 19 shows a detailed flowchart. If the operation line is "=" or "]", the key is ignored. If line feed F is set, line feed operation is performed. Write the operator “=” and the item R in the memory line indicated by the input R. Write the display R in the operation R and set the operation F. The movement during display movement moves the display R to the “=” line after the operation line. If there is no "=" line, move the display to the line indicated by input R.

[AC key] FIG. 20 shows a detailed flowchart. Clears the stored contents other than memory. Movement during display movement can be cleared only after the operation line. Write the value of display R-1 to input R.

[C key] FIG. 21 shows a detailed flowchart. If a number has been entered on the operation line, reset the value on the operation line to "0". Operation line operator is "="
Or, if "]" and no number are entered, clear the memory line itself. Therefore, by operating the C key, the stored contents can be deleted sequentially. The operation during display movement returns to the value stored in the line.

[Digit Correction Key] FIG. 22 shows a detailed flowchart. Decrease the numerical value of the operation line by one digit. (Excluding the equal line) If there is no data in the operation LR,
Copy the numerical value of the memory line indicated by the display R to the operation LR.
Set operation F. Shift operation LR right.

[Up key] FIG. 23 shows a detailed flowchart. Moves the display down one whole display. If there is no content to display, ignore the key. Checking R is 3
In the above case, "CHK" is displayed. If the verification R is 3, copy the contents of the memory row. If the check R is 4,
Calls a subroutine that shifts memory rows forward. If the check R is 5, a subroutine to shift the memory row backward is called, and the memory row is copied. After the above operation, jump to the check key routine.

[Down key] FIG. 24 shows a detailed flowchart. Moves the display up one position in the entire display. If there is no content to display, ignore the key. Checking R is 3
In the above case, "CHK" is displayed. If the verification R is 3, copy the contents of the memory row. If the check R is 5,
Calls a subroutine that shifts memory rows forward. If the verification R is 4, a subroutine to shift the memory line backward is called, and the memory line is copied. After the above operation, jump to the check key routine.

[TP key] FIG. 25 shows a detailed flowchart. Move the operation line back to the beginning of the group. If it is the beginning of the current group, return to the beginning of the previous group.

[MS key] FIG. 26 shows a detailed flowchart. Copy the contents of the memory line indicated by the current display R to the M numerical value LR and the M operation R.

[MR key] FIG. 27 shows a detailed flowchart. Copy the contents of M numerical value LR and M operation R to operation LR. The operation during display movement copies the contents of the memory line indicated by display R to the operation LR. The display R moves to the line indicated by the input R.

"K key" FIG. 28 shows a detailed flowchart. Calculates constants using M numerical value LR and M operation R. If the M value LR is 0 or the M operation R does not represent the four arithmetic operations, ignore the K key. Perform line feed operation M
The operation R and M operation LR are copied to the storage line indicated by the input R. Further, a line feed operation is performed, and a line of "=" is added, and the operation R
Copy the value of input R to and set operation F. Display R
Moves to the line indicated by the input R.

[Detection key] FIGS. 29 and 30 show detailed flowcharts. See the concept of reconciliation

[0049]

The present invention is configured as described above, and has the following effects.

Since the display is as input, the operation is easier to understand than conventional ones, and there is a sense of security even for young people and those who are not good at machines.

In the case of an operation with a small number of items, the presence or absence of an input error can be checked at a glance. If there are many items, you can move the display and check and read each line. If you make a mistake, move the display to that line and make a new entry to replace the number or operator. At this time, the operation is performed again and the numerical value of the operation result is also replaced. To see the equal line, press the “=” key to move the display to the equal line.

By inputting the same input twice and pressing the "check" key, the input can be compared to easily check whether the check is correct. If there is a mistake, it is displayed with the item number, so it is easy to confirm. By selecting the correct input, you can repeat the check and obtain the correct answer.

Since the item number is displayed before the operator,
This is useful when you know the current number of input items and want to know the number of items. It is easy to check if the calculation is performed for all items. Numerical values are displayed on multiple lines, making it easy to grasp digits and compare input with previous input. Since the calculation process is displayed, you can continue the calculation later even if you interrupt it.

Since multiplication and division are calculated with priority, the correct answer can be obtained by inputting mathematical expressions and spells. For example, assuming that the sum of 320 yen for A product, 8 yen for 220 yen for B, and 4 yen for 520 yen for C is obtained.
20 × 8 + 520 × 4 = ”is easy to operate.

By referring to the numerical values remaining in the storage device, it is possible to perform an operation for obtaining an answer with a plurality of mathematical expressions once. A trial calculation can also be performed by using the input correction function. For example,
Suppose you calculate the amount of material used during one period and multiply the material unit price to obtain the material cost. At this time, calculations such as "if you change the material unit price" or "if you change the coefficient of usage" are input corrections.
You only need to correct the relevant items and you will be asked for an answer in that case.

Since the constant calculation can be performed independently in the memory, the constant can be calculated based on the calculation result. For example, when calculating the conversion from dollars to yen, operate as x120 with 1 dollar as 120 yen and enter it into the memory with the [MS] key. In this state, if you want to convert to dollars after calculating dollars, "x120 =" is automatically inserted with the [K] key and the yen converted amount is displayed.

[0057]

[Brief description of the drawings]

FIG. 1 is a front view of the present invention.

[Figure 2] This is the pattern when the display device is fully lit.

FIG. 3 is an example of storage of a storage row in response to an operation of a storage row.

FIG. 4 shows three display example patterns in the case of the example of FIG.

[Fig.5] Operation input and display example 1 of verification.

[Fig.6] Operation input and display example 2 of reconciliation.

[Fig.7] Input and display of verification, and operation example after display.

FIG. 8 is a flowchart of a main routine.

FIG. 9 is a flowchart of a calculation subroutine.

FIG. 10 is a flowchart of an auxiliary line display subroutine.

FIG. 11 is a flowchart of a bottom line display subroutine.

FIG. 12 is a flowchart of an item R addition subroutine.

FIG. 13 is a flowchart of an input R addition subroutine.

FIG. 14 is a flowchart of a “00” key routine.

FIG. 15 is a flowchart of a forward shift subroutine.

FIG. 16 is a flowchart of a backward shift subroutine.

FIG. 17 is a flowchart of a numeric key routine.

FIG. 18 is a flowchart of a four arithmetic operation key routine.

FIG. 19 is a flowchart of an equal key routine.

FIG. 20 is a flowchart of an AC key routine.

FIG. 21 is a flowchart of a C key routine.

FIG. 22 is a flowchart of a digit correction key routine.

FIG. 23 is a flowchart of an upper key routine.

FIG. 24 is a flowchart of a lower key routine.

FIG. 25 is a flowchart of a TP key routine.

FIG. 26 is a flowchart of an MS key routine.

FIG. 27 is a flowchart of an MR key routine.

FIG. 28 is a flowchart of a K key routine.

FIG. 29 is a flowchart of a key detection routine.

FIG. 30 is a flowchart of the check routine 2;

Claims (3)

[Claims] 1. A desk-top computer capable of sequentially displaying input and calculation results on a display device having a plurality of rows and confirming and correcting the input. 2. An input is stored and stored, operations are collectively performed, priority is given to multiplication and division, and when the input is corrected,
The desk-top computer according to claim 1, wherein the recalculation is performed. 3. The desk-top computer according to claim 1, wherein the stored contents can be easily checked.