JPH06110838A - Fraction display - Google Patents

Abstract

(57) [Summary] [Object] The present invention provides, in a fraction display device equipped in a small electronic calculator or the like having a fraction input function, when inputting a fractional mathematical expression, the reading and the key operation are inconsistent. The purpose is to prevent the occurrence of input mistakes without causing the occurrence. [Structure] For example, when a fractional mathematical expression of a mixed fraction is input in the order of integer → denominator → numerator with the fractional key "a / c / b", and two numbers of integer and denominator are input, The respective numerical values are written in the denominator register 14d and the numerator register 14c and displayed on the display unit 16 as a fraction. Further, at the stage where the third numerical value as the numerator number is input, the denominator register 14d and the numerator register 14c. The respective numerical values held in 1 are transferred to and written in the integer register 14b and the denominator register 14d, respectively, and the third numerical value is written in the numerator register 14c to display the mixed fraction on the display unit 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fraction display device provided in a small electronic calculator or the like having a fraction input function.

[0002]

2. Description of the Related Art Conventionally, a small electronic calculator having a fraction input function is provided with a fraction key with the symbol "a.b / c", for example, and a fraction input can be performed by a combination operation of the numeric input key and the fraction key. It is configured to do.

That is, when inputting a mixed fraction in the conventional small-sized electronic computer with the fraction input function described above, the integer a
The key operation is performed in the order of inputting a numerical value of "→ fractional key" ab / c "→ inputting a numerical value of numerator b → fractional key" ab / c "→ inputting a numerical value of denominator c.

[0004]

However, for example, the daily reading in Japan of the mixed number "2,3 / 4" is as follows:
Since it is "2 and 3/4" and is read in the order of integer → denominator → numerator, there is a possibility that the order of key operations when inputting the above-mentioned fractional expression may be inconsistent, resulting in an input error.

The present invention has been made in view of the above problems.
An object of the present invention is to provide a fraction display device capable of preventing the occurrence of an input error without causing a discrepancy in the order of reading and key operation when inputting a fractional expression.

[0006]

That is, a fraction display device according to the present invention comprises a numerical value input means, a fraction input means operated at the time of inputting a fraction, and a fractional expression input by the numerical value input means and the fraction input means. And a fraction input control means for determining the numerical value input by the numerical value input means in the order of integer, denominator, and numerator of the denominator or the denominator and numerator in accordance with the operation of the fraction input means. It is configured with.

[0007]

In other words, the order of inputting numerical values in the fractional expression can be performed in correspondence with everyday reading.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of an electronic circuit of an electronic computer equipped with a fraction display device according to an embodiment of the present invention. The electronic computer includes a CPU (central processing unit) 11. There is.

The CPU 11 controls the operation of each part of the circuit based on the key operation signal from the key input unit 12.
The CPU 11 includes a ROM 1 in addition to the key input unit 12 described above.
The display unit 16 is connected via the 3, the input buffer 14, and the display buffer 15.

The key input unit 12 includes a numeric keypad 17 such as a numeric keypad and an operator key, a fractional key for inputting a mixed fraction "a", a fractional key "a.c / b", "c / b", etc. Various function keys such as a mode key group 18 and other operation execution keys are provided. The ROM 13 stores a calculation control program, a display control program, etc. according to various key operation signals from the key input unit 12.

The input buffer 14 is composed of a RAM, and has variable value data and CP input from the key input unit 12.
It has a register group for storing the operation value data processed in U11.
An X register 14a, an integer register 14b, a numerator register 14c, a denominator register 14d, a flag register 14e and the like are provided.

The display buffer 15 has an image storage area corresponding to the display area of the display unit 16 at a ratio of 1: 1 and displays the key input data from the key input unit 12 and the arithmetic processing data in the CPU 11 in the display control program in the ROM 13. The display data held in the display buffer 15 is displayed and output on the display unit 16. Next, the operation of the fractional display device of the electronic calculator having the above configuration will be described. FIG. 2 is a flow chart showing a first embodiment of the fractional expression input process in the fraction display device of the electronic computer. FIG. 3 is a diagram showing a fraction display state according to the first embodiment of the fraction display device.

That is, for example, two and three quarters of mixed numbers
To input "2,3 / 4", first, the key input unit 12
When "2" of the ten-key pad 17 is input, the input numerical value "2" is written in the X register 14a of the input buffer 14 through the numerical input determination processing and the flag determination processing (steps S1 to S3). Then, as shown in FIG. 3A, the key input numerical value “2” is displayed in the display buffer 15.
Is displayed as an integer on the first digit of the display unit 16 (step S4).

When the fractional key "a.c / b" in the fractional mode key group 18 is operated, it is determined whether the flag data of the flag register 14e is "2" through the fractional key determination process and the fractional key determination process. Is determined (step S1
→ S5, S6).

In this case, since the flag data is "0", it is determined to be "NO", "1" is added to the flag data "0", and the X register 14a is subjected to the flag determination process. The held numerical value data "2" is written in the denominator register 14d (steps S7 to S).
9).

Then, as shown in FIG. 3B, an inverse L-shaped fractional mark is displayed on the display unit 16 above the numerical data "2", and the numerical data "2" is the denominator at this stage. It is shown as a number (step S4).

When "4" of the ten-key pad 17 is operated, the input numerical value "4" is changed to the numerator register 14 of the input buffer 14 through the numerical register judging process and the flag judging process.
It is written in c (steps S1, S2 → S10).

Then, as shown in FIG. 3C, the numerical data "2" and the key input numerical value "4" are displayed above the fraction data on the display unit 16 and are shown as the number of molecules at the present stage. (Step S4).

Further, the fractional mode key group 18 is also provided.
When the fractional key "a.c / b" in is operated, it is determined whether the flag data in the flag register 14e is "2" through the fractional key determination process from the above-mentioned number determination process (steps S1 → S5). S6).

In this case, since the flag data is "1", it is determined to be "NO", and after the flag data "1" is added to "2", the denominator register 14d is subjected to the flag determination process. The numerical value data "2" held in the integer register 14b and the numerical value data "4" held in the numerator register 14c are written in the integer register 14b.
Is written in the denominator register 14d (steps S7, S
8 → S11, S12).

Then, as shown in FIG. 3D, the display unit 16 has a numerical data "4" in the first digit, a blank in the second digit with the fractional mark, and a third digit with the fractional mark. Numerical data "2" is displayed on the screen, and at this stage, the numerical data "2" is shown as an integer and "4" is shown as a denominator (step S4).

Then, when "3" of the ten-key pad 17 is input, the input numerical value "3" is changed to the numerator register 14 of the input buffer 14 through the numerical register judging process and the flag judging process.
It is written in c (steps S1, S2 → S10).

Then, as shown in FIG. 3E, the display unit 16 has numerical data "4" in the first digit and numerical data "3" in the second digit with a fractional mark. 3
Numerical data "2" is displayed in the digit and numerical data "2"
Is an integer, “4” is a denominator, and “3” is a numerator (step S4).

Therefore, according to the fraction display device in the electronic computer having the above-described configuration, for example, fractional mathematical expressions of mixed fractions are input in the order of integer → denominator → numerator while being separated by the fractional key "a / c / b". , The integer and the denominator are input, the respective values are written in the denominator register 14d and the numerator register 14c, and the display unit 16
Is displayed as a fraction, and when the third numerical value as the numerator number is input, the numerical values held in the denominator register 14d and the numerator register 14c are transferred to the integer register 14b and the denominator register 14d, respectively. In addition to writing the third numerical value in the numerator register 14c and displaying the mixed fraction on the display unit 16, it is possible to input the fractional mathematical expression in accordance with the daily reading, and it is possible to avoid input errors. Occurrence can be prevented. FIG. 4 is a flowchart showing a second embodiment of the fractional expression input process in the fractional display device of the electronic computer. FIG. 5 is a diagram showing a fraction display state according to the second embodiment of the fraction display device.

That is, for example, the mixed fractions 2 and 3/4
To input "2,3 / 4", first, the key input unit 12
When "2" of the ten-key pad 17 in is input, the input numerical value "2" is changed to the input buffer 1 through the numerical input determination process.
4 is written in the X register 14a (steps A1, A
2).

Here, it is judged whether the flag data in the flag register 14e is "0" or "1". In this case, it is judged as "0" and the display processing is started (step A3). Then, as shown in FIG. 5 (A), the key input numerical value “2” is displayed on the display unit 16 via the display buffer 15.
An integer is displayed in the block (step A4).

When the integer key "a" in the fractional mode key group 18 is operated, the numerical value data "2" held in the X register 14a is converted into an integer through the integer number judgment process and the integer key judgment process. In addition to being written in the register 14b, the numerical data "2" has an inverted L-shaped fraction mark added to the third block of the display unit 16 as an integer value of a mixed fraction, as shown in FIG. 5B. It is displayed (steps A1 → A5, A6 → A4).

When the "4" of the ten-key pad 17 is input, the input numerical value "2" is written in the X register 14a of the input buffer 14 through the numeral input judging process (steps A1 and A2).

Here, it is judged whether the flag data in the flag register 14e is "0" or "1". In this case, it is judged as "0" and the display processing is started (step A3).

Then, as shown in FIG. 5C, the key input numerical value "4" is displayed on the display unit 16 via the display buffer 15.
Is displayed as the denominator in the first block of (Step A
4).

When the fractional key "c / b" in the fractional mode key group 18 is operated, the flag data of the flag register 14e is set to "1" through the above-mentioned numerical value determination processing, integer key determination processing and fractional key determination processing. The numerical value data "4" held in the X register 14a is written in the denominator register 14d while being set to 1 ", and the display unit 16 shows the denominator as a denominator, as shown in FIG. A fractional mark is additionally displayed above "4" (step A1 → A5 → A7 to A9 → A4).

When the "3" of the ten-key pad 17 is input, the input numerical value "3" is written in the X register 14a of the input buffer 14 through the numeral registration processing (steps A1 and A2).

Here, it is judged whether the flag data in the flag register 14e is "0" or "1". In this case, it is judged as "1" and the numerical data "3" held in the X register 14a. Is written in the numerator register 14c (step A3 → A10).

Then, as shown in FIG. 5E, the numerical data "3" is substituted and displayed in the blank position sandwiched between the fractional marks on the display unit 16, and the numerical data "2" is an integer, "4". Is shown as a denominator and “3” is shown as a numerator (step A4).

Therefore, in the case of the fraction display process of the second embodiment, the integer key "a" and the fraction key "c / b" are selectively used to input in the order of integer → denominator → numerator. Since each numerical value data is directly written in the integer register 14b → the denominator register 14d → the numerator register 14c in order to display the mixed fraction on the display unit 16, the fractional expression can be read daily as in the first embodiment. It is possible to input them together, and it is possible to prevent the occurrence of input errors.

[0037]

As described above, according to the present invention, the numerical value input means, the fraction input means operated at the time of inputting the fraction, and the display means for displaying the fractional mathematical expression inputted by the numerical value input means and the fraction input means. And a numerical value input by the numerical value input means is provided with a fraction input control means for determining the integer of the fractional expression, the denominator, and the numerator in order, or the denominator and the numerator in accordance with the operation of the fraction input means. Therefore, when inputting a fractional expression, it is possible to prevent the occurrence of an input error without causing a discrepancy in the order of reading and key operation.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an electronic circuit of an electronic computer equipped with a fraction display device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a first embodiment of a fractional expression input process in the fractional display device of the electronic computer.

FIG. 3 is a diagram showing a fraction display state according to the first embodiment of the fraction display device.

FIG. 4 is a flowchart showing a second embodiment of a fractional expression input process in the fraction display device of the electronic computer.

FIG. 5 is a diagram showing a fraction display state according to a second embodiment of the fraction display device.

[Explanation of symbols]

11 ... CPU, 12 ... Key input section, 13 ... ROM, 14
... input buffer, 14a ... X register, 14b ... integer register, 14c ... numerator register, 14d ... denominator register, 14e ... flag register, 15 ... display buffer, 1
6 ... Display unit, 17 ... Numeric keypad, 18 ... Fractional mode key group.

Claims (1)

[Claims] 1. A numerical value input means, a fractional input means operated when inputting a fraction, a display means for displaying a fractional mathematical expression input by the numerical value input means and the fractional input means, and an input by the numerical value input means. According to the operation of the fraction input means, the numerical value is the integer of the fractional expression, the denominator, the order of the numerator, or
Alternatively, a fraction display device comprising: a fraction input control means for determining a denominator and a numerator in this order.