JPS63113656A - Electronic calculator - Google Patents

Abstract

PURPOSE:To reduce the labor for key input operation by outputting an arithmetic result in a storage means again after or without friction processing when a friction processing form is changed. CONSTITUTION:Change-over switches 2 and 3 are set to 3 and 5/4 and then key operation is carried out in the order of '7, 8, and 9', 'divided by ', '4, 5, and 6', and '=', so that an arithmetic result '1.730' obtained by rounding the 4th digit below the decimal point as the friction processing is displayed after the input numbers '789' and '456' are displayed. Then when the change-over switches 2 is set to 2 without key input, an arithmetic result '1.7303' obtained by rounding the 5th digit below the decimal point as the friction processing is displayed. Further, the change-over switch 2 is changed to F, all digits of the arithmetic result in the arithmetic result holding circuit 8 which can be displayed are displayed as '1.7302631' without the friction processing.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a small electronic calculator that performs numerical calculations and outputs the calculation results, and particularly relates to a small electronic calculator that performs rounding and outputs the calculation results. .

[Prior Art] Conventionally, small electronic calculators have been equipped with a means for inputting rounding digits, for example, whether to round off the digits below the decimal point, and means for inputting a rounding method such as rounding, rounding up, or rounding down. A configuration in which a user operates an input means to input and round a numerical calculation result in a set rounding format and outputs (displays) the result is widely adopted.

[Problems to be Solved by the Invention] However, in the conventional configuration of such a computer, the calculation results before rounding are not retained and are not output. Therefore, when the user wants to know them, they have to input them using the processing digit input means. You must set it to output all digits of the calculation result, set it so that no rounding is performed within the number of digits that can be output, and then repeat the input operation for the same calculation.

Also, if the user wants to know the result of the same calculation using different rounding digits or processing methods,
After setting the rounding digits or processing method as such,
There was the inconvenience of having to repeat the input operation for the same calculation again.

[Means for Solving the Problems] In order to solve the above-mentioned problems, according to the present invention, means for inputting the rounding form of the numerical calculation results is provided, and the numerical calculation results are processed according to the input by the input means. In a small electronic calculator that performs rounding and output, a storage means for holding the calculation result before rounding is provided, and after outputting the rounded calculation result and before inputting the next calculation, the rounding is performed by the processing form input means. When the format is changed, the calculation results in the storage means are rounded or output again without rounding depending on the change.

[Function] According to such a configuration, once the user manually performs a numerical calculation, he or she can obtain the same calculation result by only changing the rounding format using the processing format input means. You can see multiple types of results with or without rounding in different formats.

[Embodiments] Hereinafter, details of embodiments of the present invention will be described with reference to the attached drawings.

FIG. 1 shows a top view of a small electronic calculator according to an embodiment of the invention.

The area indicated by the code 1 on the top of the calculator is a calculation key manual section that contains a numeric keypad for inputting numerical values from θ to 9, a decimal point key, calculation designation keys for specifying various calculations such as four arithmetic operations, function keys such as clear, Various input keys such as an equal key and an equal key for instructing the execution of calculations are arranged.

Further, on the top surface of the calculator, there are provided a changeover switch 2 for specifying the digit to be processed in the rounding of calculation results, and a changeover switch 3 for specifying the rounding method.

The numbers 4 to 0 displayed below the changeover switch 2 each indicate the number of digits below the decimal point, and by adjusting the position of the changeover switch 2 to 4 to O, the fraction of digits below that number can be changed. is processed. Further, the letter F displayed below the changeover switch 2 means all digits, and by adjusting the position of the changeover switch to this, all the digits that can be displayed in the calculation result are displayed. In other words, rounding is not performed within the range of displayable digits.

Also, the two arrows and the 5/4 display below the changeover switch 3 indicate the rounding method, and by adjusting the position of the changeover switch 3 to each of these indications, the rounding method will be rounded up from the left. Rounding off, truncation, etc. are specified.

Further, on the top surface of the calculator, there is provided a display section 4 consisting of a liquid crystal display, an LED display, or the like for displaying the numbers and results of calculations.

Next, FIG. 2 schematically shows the overall configuration of the computer of this embodiment.

In FIG. 2, reference numeral 6 denotes an arithmetic processing unit that performs arithmetic operations and drives the display unit via a driver (not shown).
It consists of SI, etc. The arithmetic processing section 6 is provided with an arithmetic circuit 7, an arithmetic result holding circuit 8, and an arithmetic result processing circuit 9.

The calculation circuit 7 performs various calculations in response to inputs from the calculation key manual section 1. The calculation result holding circuit 8 is composed of a register that holds the calculation results of the calculation circuit 7. In addition, the calculation result processing circuit 9 converts the calculation result stored in the calculation result holding circuit 8 into a fraction according to the processing digit and processing method input and specified from the rounding format input unit 5 consisting of the changeover switch 1.2 described above. The processing is performed and the results are output to the display section 4.

Note that the display unit 4 is configured to also output a set number for calculation input from the calculation key manual unit 1 to the calculation processing unit 6 via a processing circuit (not shown) in the calculation processing unit 6.

Based on this configuration, the arithmetic processing unit 6 performs the following processing operations according to the steps shown in FIG. Note that this process is performed by, for example, a ROM (not shown) of the arithmetic processing unit 6.
This is done according to a program stored in the .

The arithmetic processing unit 6 first performs the numerical calculation input in step S1 of FIG. let it happen.

Next, in step S2, the calculation result is stored in the calculation result holding circuit 8, and then, in step S3, the presence or absence of key human power is checked.

If there is key manual power, the process returns to step S1, but if there is no key power, then in step S4, the rounding digits and processing method input and designated by the rounding form input section 5 (changeover switch 2.3) is confirmed.

Then, in step S5, the fraction of the calculation result stored in the calculation result holding circuit 8 is processed according to the content confirmed in step S4, and the processed result is outputted to the display section 4 in step S6, and then, in step S3 Return to

Thereafter, the loop of steps 33 to S6 is repeated until the next input is received, that is, until the next calculation input is received. During that time, if the rounding digit or processing method is changed by the changeover switch 2.3 of the rounding format input section 5, the rounding of the original calculation result stored in the calculation result holding circuit 8 will be performed according to the content. will be performed and the results will be displayed.

FIG. 4 explains a specific example of the operation of this embodiment based on such processing, and shows the operation of the changeover switch 2.3 and the key of the calculation key manual section 1 when performing the calculation "789÷456=". The operations and the display contents of the display unit 4 are shown chronologically from top to bottom.

As shown in Figure 4, first set the selector switch 2.3 to 3 and 574, then press the keys in sequence r7, 8, 9J.
, r÷J, r4,5,6J.

By doing something like "=", r789 of the numeral
After J and r456J are displayed, the calculation result rl, 730 J, is rounded off to the fourth decimal place as a rounding process.
is displayed.

Next, by changing the changeover switch 2 to 4 and setting it without manual keystrokes, 5 decimals after the decimal point will be processed.
The calculation result after rounding off the digits is r 1.7303J
is displayed.

Furthermore, by changing the changeover switch 2 to F and setting it, all the displayable digits of the calculation result stored in the calculation result holding circuit 8 will not be rounded and will be set as r 1.7302.
1331 J is displayed. In this case, rounding is performed at the digit below the lowest digit, and if switch 3 is set to round up, r 1.7302632 J
is displayed.

In this way, according to this embodiment, the user only needs to operate the input key for calculation once, and then switch
The same calculation result was rounded in different forms by simply changing the settings of . Or you can know each result without rounding.

On the other hand, in conventional calculators, in order to know whether the same calculation result is rounded in a different format or not rounded, change the setting of the switch as shown in Figure 5 in the same format as Figure 4. After doing so, the user had to perform the key operations again to enter the calculation.

As is clear from the comparison between FIG. 4 and FIG. 5, this embodiment saves the effort of key operations and is extremely convenient.

In the above configuration, the input numbers and calculation results may be output by a recording unit or a single audio output stage.

[Effects of the Invention] As is clear from the above description, according to the present invention, the present invention includes means for inputting a form of rounding of numerical calculation results, and outputs the rounded numerical calculation results according to the input by the input means. A small electronic calculator is provided with a storage means for holding the calculation result before rounding, and the rounding form is changed by the processing form input means after outputting the rounded calculation result and before inputting the next calculation. In this case, the calculation results in the storage means are rounded or outputted again without rounding according to the change, so that the user can read the results of a certain calculation rounded in a different format. , or if you want to know the original result without rounding, you only need to operate the rounding input means without repeating the calculation input operation, which saves you the trouble of operation and is extremely convenient. can get.

[Brief explanation of the drawing]

Fig. 1 is a top view of a small electronic calculator according to an embodiment of the present invention, Fig. 2 is a block diagram showing the overall configuration of the computer, and Fig. 3 is a flowchart showing the processing procedure by the arithmetic control section in Fig. 2. , FIG. 4 is a table showing switch and key operations and display contents according to this embodiment over time, and FIG. 5 is a table showing switch and key operations and display contents by a conventional computer. 1... Arithmetic key manual section 2.3... Changeover switch 4... Display section 5... Fraction processing form input section 6... Arithmetic processing section 7... Arithmetic circuit 8... Arithmetic result Holding circuit 9...Arithmetic result processing circuit Fig. 5

Claims (1)

[Claims] A small electronic calculator comprising a means for inputting a rounding form of numerical calculation results, and for outputting the rounded numerical calculation results according to the input by the input means, comprising a storage means for retaining the calculation results before rounding. If the rounding form is changed by the processing form input means after outputting the rounded calculation result and before inputting the next calculation, the calculation result in the storage means is rounded according to the change. , or a small electronic calculator configured to re-output without rounding.