JPS5875263A - Arithmetic device - Google Patents

Abstract

PURPOSE:To display a specified exponent and a calculated mantissa on a display device systematically, by allowing the resulting exponent obtained by previously specifying, storing, and processing plural exponents which are arithmetic results to coincide with the specified exponent, and calculating the mantissa of the arithmetic result. CONSTITUTION:When a key for exponent specification is operated on key input equipment 2, a control circuit 21 decodes its key data to store the result in a storage part 30. Then when a numeral for arithmetic and an arithmetic command are inputted with other keys, an arithmetic circuit 25 performs arithmetic to store the result in a storage means 31, and then performs conversion in such a way that the mantissa is equalized to the number of the exponent-specified storage means 30 and then stores the processing result in a storage means 27, thereby displaying the arithmetic result on a display device 3 together with the mantissa and specified exponent.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an arithmetic device including an input means and a display, such as a desktop electronic calculator.

In conventional arithmetic devices, the exponent of the arithmetic result changes depending on the number entered by pressing the numeric keypad, etc. Therefore, the exponent varies, and in order to align multiple arithmetic results to the same exponent, it is necessary to convert. Alternatively, it was necessary to perform further key operations to align the exponent units.

The object of the present invention is to solve the above-mentioned technical problems and to provide an arithmetic device that can be understood by simple key operations and by visual inspection.

Below, I will explain one recommended page. FIG. 1 is a front view of an embodiment of the wooden invention. The body 1 of the arithmetic device is equipped with a key-operated device 2 as an input means consisting of a plurality of keys for inputting numbers, and a display 3 consisting of a liquid crystal, a light emitting diode, etc., on which inputted numbers, calculation results, etc. are displayed. . The key human power device 2 has a key 4 with a 0 displayed and a key 4 with a P displayed t.
l, key 5.2 displayed key 10, y displayed key 11.8 displayed key 12.9 displayed key also key 15, □ displayed key 16, 2ndF
It has a key 18 labeled "XP" and other keys.

The displayed characters represent their respective functions.

For example, the 1 printed on the key 5 represents the number 1, and the p displayed above it represents the exponent Bikona, ie, 10-. The key 18 is the key that is first suppressed when specifying an index, and is also the key that has the second function displayed above the other keys.

When setting p, press key 5 after pressing key 18. In addition, n, μ, m*KeM*G displayed in keys 6 to 11 are the exponents 9, nano or 10, micro or 10, milli or 10"-', kilo or 108, mega or 106, or giga 109 respectively.

When specifying an exponent, first press key 18 when entering the number.
is pressed and then other keys such as pico or i
When specifying o""2 as an index, key 5 is depressed. When specifying a micro index, that is, 10-6, it is sufficient to press keys 18 to 7 in this order. key 1
If another key is pressed after 8, the second function of the other key will not be released.

If the key 18 is pressed in the middle of setting a number, the second function of the next pressed key is used, and no index is specified.

FIG. 2 is a block circuit diagram of the embodiment shown in FIG. When any key of the key manpower device 2 is depressed, the control circuit 21 sequentially gives a key strobe signal to the key manpower device 2 via the line 22. It is possible to decipher which key has been suppressed by the signal transmitted. When no index is specified, a calculation control signal is applied from the control circuit 21 to the calculation circuit 25 via the line 24. The result calculated in the calculation circuit 25 is sent to the storage means 2 via the line 26.
7 is stored. The calculation results stored in the storage means 27 are decoded by the decoder 28 and displayed on the display 3.

When specifying an index, a storage control signal is sent from the control (S1 path 21 to the storage means 27°30.3 via line 29).
1, and information specifying the index is stored in the storage means 30. Furthermore, once an index is specified, the specified index is stored in the storage means 30 unless the index is specified again. After that, when another key is suppressed, the control circuit 21 decodes the suppressed key, the arithmetic circuit 25 performs a calculation, and the result of the calculation is stored in the storage means 31. The exponent of the calculation result stored in the storage means 31 and the exponent designated as the index in the storage means 30 are compared in the calculation circuit 25, and the mantissa of the calculation result stored in the storage means 31 is converted into the designated exponent. Treat it like it's worth it.

The calculation results processed in this calculation circuit 25 are stored in the storage means 27, decoded in the decoder 28,
It is displayed on the display 3.

For example, when the key 5 is operated to specify an index in units of p, that is, 10-12, information of p -12 is stored in the storage section 30. After that, if another key is suppressed and the calculation result is 7.89 X 10"-14, this calculation result 7.89 X 10"-" is stored in the storage means 31, and the calculation circuit 25 The mantissa is 7.89 in
0.0789xl to match the index specified -12
Convert the calculation result to the format 0.0789X10
The data is processed and stored in the storage means 27, and displayed on the display 3 as shown in FIG. 3(1). If it is a conventional arithmetic device, the display will be as shown in FIG. 3(2) or FIG. 3(3). The next calculation result is 1.23456X10-8
If so, it is similarly processed to 12345.6X10- and displayed on the display 3 as shown in FIG. 4(1). If it is a conventional arithmetic device, it is shown in Figure 4 (2) or Figure 4.
It is displayed as shown in Figure (3). Therefore, the exponents of the calculation results are unified and displayed as the designated exponents as shown in FIG. 3 (1) and FIG. 4 (1). Therefore, multiple calculation results can be understood just by looking at them visually.

Conventionally, when entering 0,123 I had to perform suppression operations nine times, but
In this embodiment, as shown in FIG. 5 (2), key 4→key 1
5-+Key 5 → Key 6 → Key 7 → Key 18 → Key 5 l
It is only necessary to perform the suppression operation seven times in the 1st order, improving operability.

As described above, according to the present invention, the exponents of multiple calculation results match the pre-designated exponent and are uniformly displayed on the display. can do.

[Brief explanation of drawings]

FIG. 1 is a front view of an embodiment of the present invention, FIG. 2 is a block circuit diagram thereof, FIGS. 3 and 4 are diagrams for explaining the operation in which calculation results are displayed on the display 3, and FIG. FIG. 5 is a diagram for explaining the order of pressing keys when entering numbers. 2... Key human power device, 3... Display, 4-18...
・Key, 21... Control circuit, 25... Arithmetic circuit, 2
7, 30. 31... Storage means, 28... Decoder agent Patent attorney Kei Nishi Part Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] Input means for specifying in advance an exponent of the calculation result, storage means for storing information on the specified exponent, means for matching the exponent of the calculation result with the specified exponent and calculating the mantissa of the calculation result, and the processing. An arithmetic device comprising means for displaying the mantissa and the specified exponent.