JPH04132554U - small electronic calculator - Google Patents

Abstract

(57) [Summary] [Purpose] This invention relates to the improvement of a small electronic calculator with a dot pattern display that displays input arithmetic expressions in the order in which they are input and finally processes them. [Structure] A small electronic calculator equipped with a key input section 1, a control section 2 for processing input arithmetic expressions, and a display section 7 for displaying the processed data. This time key register 4 holds the current time data,
Compare the previous key register 5 that holds the previous data entered by the previous key with the data held in the current and previous key registers 4 and 5, and if the current data and the previous data are both operation symbol data, the current data is A key judgment section 6 which selects data and decides to select the previous data if both data are decimal point data, and a key buffer 3 which stores and holds an input calculation formula including the data selected by this key judgment section 6. It is configured with.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is based on a dot panel that displays the entered arithmetic expressions in the order in which they are entered and then processes the arithmetic expressions at the end. Concerning a small electronic calculator with turn display.

0002

[Conventional technology]

Traditional small electronic calculators with dot matrix display require key input. Since the entered numbers, operation symbols, etc. are accepted and displayed in the order in which they were input, If you enter an incorrect formula, it will be accepted, and the syntax will be correct when you try to perform the calculation. “SYN・ERROR” is displayed indicating that the I had to press Y to go back and make corrections.

0003

[Problem that the idea aims to solve]

This idea was made to solve the above-mentioned problems, and the key input A small electronic device that determines the correctness of the syntax at each stage and prevents the input of syntactically incorrect arithmetic expressions. The purpose is to provide a child-style calculator.

0004

[Means to solve the problem]

The small electronic calculator of this invention can handle numeric data, decimal point data, and arithmetic symbol data. A key input means for inputting data, and a key input means for processing arithmetic expressions input by this key input means. A small computer equipped with arithmetic processing means for processing the data and a display means for displaying the processed data. In a type electronic calculator, the first memory that holds the current data entered by the key this time. means, a second storage means for retaining the previous data entered by the previous key; Compare both data stored in the second storage means and compare the current data and previous data. If both data are operation symbol data, select the data this time, and both data are decimal point data. In the case of data, there is a comparison judgment method that selects the previous data, and a comparison judgment method that selects the previous data. and a third storage means for storing and holding the input calculation formula including the selected data. It is characterized by

[0005]

[Effect]

By configuring this way, input expressions that are impossible due to the syntax of the arithmetic expression can be handled appropriately. This has been modified so that the user does not have to make any corrections.

[0006]

【Example】

An embodiment of this invention will be described below with reference to the drawings. Figure 1 shows this example. This is a block circuit showing the hardware configuration.

[0007] In the same figure, 1 is a key input section, and numeric key 1 has keys from 0 to 9 arranged. a, operation keys 1b such as operation symbols “+”, “-”, “×”, “÷”, etc., and decimal point key 1 It is equipped with c. This key input section 1 is used to check input data, perform arithmetic processing, and The control unit 2 is connected to a control unit 2 that controls each part of the equipment.

[0008] The control unit 2 has a keypad in which the arithmetic expressions input without syntactical problems are written. F3, current key register 4, which holds the data entered by the current key, key input last time Previous key register 5 that holds input data, these key registers 3 and 4 A key determination unit 6 and a liquid crystal dot matrix determine whether key data is selected or not. The display unit 7 is configured to control a display section 7 made up of a display element of a box.

[0009] The processing operation of the embodiment configured as described above is illustrated in the flowchart shown in FIG. When operating based on this flow, the display example shown in Figure 3 will appear. Therefore, I will explain.

0010 In the flowchart shown in FIG. 2, the processing operation is a key input operation in step A1. It starts from. At this time, only the cursor is displayed on the display section 7, as shown in Figure 3(1). It is shown. In step A1, the number or calculation key is operated and the data is When the data is input, the data currently held in the key register 4 is entered in step A2. is transferred to the previous key register 5, and the key-input data is transferred to the key register 5, for example, as a number. Assuming that the character data is “1”, this numerical data “1” will be input and held in the key register 4 this time. held.

[0011] In step A4, it is checked whether data was held in the key register 5 last time. For example, if it is the beginning of a key input, it is natural that the data was held in the previous key register 5. Since it is not, the determination is NO and the process proceeds to step A5. In step A5, If the entered key data is judged to be a number or a decimal point, this key data is determined in step A6. Write the data to the start address of key buffer 3, and in the next step A7 The written data is displayed on the display section 7 as shown in FIG. 3(2). Further steps If it is determined at step A8 to continue key input, the process returns to step A1.

0012 If the key input operation is the second time or later and it is determined YES in step A4, In the next step A9, check the data held in the previous key register 5 and Each judgment is made based on the data. This means that this retained data is a number If it is data, the process advances to step A10, and the data held in the key register 4 this time is For example, the calculation data “+” inputted this time is transferred to the next address in key buffer 3. In step A7, display on the display section 7 as shown in Figure 3(3). Ru.

[0013] For example, the calculation data “+” entered last time is an input error and should be “×”. Assuming that the correct calculation data “×” is Continue to input after the ``+''. Then, in step A9, the previous key was The calculation data is determined to be "+" and the process proceeds to step A11. In step A11, This process is performed by comparing the previous key data with the data entered this time. In this case, the key input this time is the calculation data “×” again, so this step At A11, the following judgment is made.

[0014] In other words, the data entered last time was the calculation data "+", and the data entered this time was It is determined that the fact that the data is again the calculation data “×” is an error in the syntax of the calculation expression. , select the current calculation data “×” that was input later as correct, and press the key key. Delete the previous calculation data “+” written in buffer 3 and write the current calculation data. The data "x" is written to that address in step A6. Next step In step A7, the previous operation data "+" is erased from the display section 7 and the operation entered this time is displayed. The calculation data “×” is newly displayed as shown in FIG. 3(4).

[0015] Further, the determination in step A9 is that the previous key input was a calculation key, and step A11 The judgment is that the current key input is not calculation key 1b, that is, it is a number or decimal number. In the case of point keys 1a and 1c, the process advances to step A10, and the key held in key register 4 this time is The data that is not the calculation data input this time is transferred to the next address of key buffer 3. This data is displayed in step A7. For example, next If the data “0” is input, this data will be processed in steps A1, 2, 3, 4, 9, 11, 10, 7, and 8, the display is displayed on the display section 7 as shown in FIG. 3(5). Further next If you operate the decimal point key 1c, steps A1, 2, 3, 4, 9, 10, 7, 8 will be executed. After that, the screen will be displayed as shown in Figure 3(6).

[0016] In step A9, if it is determined that the previous key data is a decimal point, the step Proceed to step A12. This step A12 looks at the data entered this time, and If the data in is a calculation or decimal point data, the syntax of the calculation expression requires that the data immediately after the decimal point be Inputting calculated data or a decimal point is considered an operational error and is ignored. At step A13, a process is performed in which this data is not written to the key buffer 3. of display In the above example, the subsequent operation of the decimal point key 1c is ignored as shown in FIG. 3(7). Calculation key 1 If b is manipulated, it is similarly ignored.

[0017] In step A12, if it is determined that the data is not arithmetic or decimal point data, If the data is numeric, it is assumed that a normal input operation has been performed and the process proceeds to step A10. normal processing is performed. For example, if you enter the numerical data “2” next, normal operation will occur. It is determined that the operation has been performed, and this data “2” is transferred to steps A1, 2, 3, 4, 9, 12, 10, 7, and 8, the display section 7 displays the image as shown in FIG. 3(8).

[0018] In addition, if calculation key 1b is input in step A5, the previous key register This means that calculation key 1b was input when no data was input to star 5. Therefore, it is judged to be an operational error in the syntax of the arithmetic expression and is ignored, and the key is changed in step A13. -Perform processing that does not write to buffer 3. Note that this invention is not limited to the above embodiments, and may be applied without changing the gist. It can be modified and implemented by

[0019]

[Effect of the idea]

This idea compares the key data entered last time with the key data entered this time. The key data is processed appropriately based on the judgment result. Even if you press the decimal point key or double press the decimal point key, the exact input may be displayed. This has the effect of eliminating the need for correction operations.

[Brief explanation of drawings]

FIG. 1 is a block circuit diagram showing the hardware configuration of an embodiment of this invention.

FIG. 2 is a flowchart illustrating the processing operation of the embodiment.

FIG. 3 is a display example when an arithmetic expression is input based on the same flow as above.

[Explanation of symbols]

1...Key input section 1a...Numeric key 1b...Calculation key 1c...Decimal point key 2...Control section 3...Key buffer 4
...Current key register 5...Previous key register 6...Key judgment section 7
...Display section

Claims (1)

[Scope of utility model registration request] 1. Key input means for inputting numeric data, decimal point data and arithmetic symbol data, arithmetic processing means for processing arithmetic expressions input by the key input means, and display means for displaying the arithmetic processed data. A small electronic calculator comprising: a first storage means for holding the current data entered by the key this time; a second storage means for holding the previous data entered by the key last time; 2. Compare both data held in the storage means, and if the current data and previous data are both arithmetic symbol data, select the current data, and if both data are decimal point data, select the previous data. 1. A small-sized electronic calculator comprising: a means for comparing and determining an input calculation formula;