JPS5880735A - Display system of exponent data - Google Patents

Abstract

PURPOSE:To increase a range of the numerical values that can be indicated and to obtain the numerical value that can not be so far calculated, by detecting the exponent of an arithmetic data and displaying a mantissa data with its digit number varied in accordance with the digit number of the detected exponent. CONSTITUTION:The data given from a key input part 1 is applied to a control part 2, and the data corresponding to the operation of keys are delivered through an output line (a). At the same time, the addresses are delivered through output lines (b) and (c), and various types of instructions are delivered through an output line (d). The output lines are selected by a selector 3 which supplies the addresses, and the data is fed to an arithmetic memory 4. Then the contents of the memory 4 are selected by a selector 5, and the data is fed to an arithmetic circuit 6, an exponent digit detecting part 7 and an exponent digit number discriminating part 8 respectively. The position of the exponent digit is detected at the part 7 on the basis of an instruction given from the part 2, and the exponent digit number is discriminated at the part 8 and applied to a dislay control part 9. Then the arithmetic result of the circuit 6 is fed to the part 9, and the digit number of the mantissa data is varied in accordance with the digit number of the exponent. Then a numerical range is magnified to be displayed at a display part 10.

Description

[Detailed description of the invention] Regarding the data display method.

In the case of conventional small electronic calculators and switching function calculators equipped with functional calculation functions, the input range is lxl < I x 1 (l, where the exponent is , if 1≧1×10, an error is displayed as an overflow, and lxl<
Become I X 1 0 as underflow 0
It is displayed. In this case, the calculation is performed after each calculation of the check 221 for overflow and underflow.

However, in conventional functional arithmetic using the above calculation method, @ in the final result cannot be displayed.
There are cases where an overflow or underflow occurs during the +1 operation, making it difficult to find the answer.

For example, in the formula Irr r = 1.7';J'〒]7, lxl. ＞txo+50 or lyl ＞I
1050 if i1, x25<'l:J'. y
Since the operation in step 2 causes an overflow, it is treated as an error.

When Ixl>23o, it becomes ex or oh goo flow,
I don't want an answer. In this case, the actual answer is tan h x
” d-, becomes 1.

Furthermore, when a calculation formula is programmed and executed on a calculator other than a functional calculator, such as a Grodarum calculator,
In many cases, overflow or underflow occurs during the calculation, making it difficult to obtain the correct value. Another problem was that when creating a program, the calculation formula had to be transformed in consideration of the above.

The present invention has been made in view of the above points, and it is possible to expand the numerical range that can be displayed by configuring the exponent part and the mantissa part in a fluid manner, and to enable calculations that were not possible in the past. The purpose is to provide a method for displaying index data that is possible.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An exemplary embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the key human power section J indicates data input from the key human power section J and is sent to the control section 2. Gono Seiichi Part 1 24'i example t/'i' ROM (read-only
It is composed of a memory (memory) that stores each Yuzu microprogram, and output line A, 1r for key operation, and output line B.

The address is output from C, and each glaze instruction is output from output line d. The address and address outputted from the output lines a+b of the control section 2 are not sent to the selector 3. This selector 3 selects an input/output line according to the address from the control section 2, and transfers the selected data to the calculation memory 4. The calculation memory 4 is composed of various calculation registers such as an X register 4a+Y register 4b and a Z register 4c. The registers 4m, 4b, etc. are, for example, 15 as shown in FIG.
In the digit structure, the 0th to 3rd digits are the exponent part, and the 4th to 14th digits are the mantissa part. Furthermore, the exponent part stores exponent data in the O to third digits, the third bit of the third digit stores a sign indicating the significand of the exponent digit, and the fourth bit stores a sign indicating the significand significand. It has become. Therefore, each register 4a r 4b in the soil memory 4...
・The text written in 1 is sent to 07 and 5. The selector 5 selects an input/output line according to the address given from the control section 2 via the output line C, and outputs the selected data to the arithmetic circuit 6, the exponent digit detection section 7, and the exponent digit number determination section 8. The exponent digit detection section 2 detects the position of the exponent digit according to an instruction given from the output line d of the control section 2, and provides the detection signal to the control section 2, the arithmetic circuit 6, and the exponent digit number determination section 8. The exponent digit number determination unit 8 determines the exponent digit number and provides the determination result to the display control unit 9. On the other hand, the arithmetic circuit 6 performs arithmetic operations on the data input from the selector 5, and outputs the result of the arithmetic operation to the memory 4 via the selector 3 and to the display control section 9.

The arithmetic circuit 6 also determines the presence or absence of data for the arithmetic result.
Equipped with an internal determination unit that determines the presence or absence of a carry signal, etc.
The determination result J is sent to the control section 2. The display control section 9 displays data on the display section 10 by controlling the number of digits of the exponent part and the mantissa part according to the determination result of the exponent digit number determination section 8. The display section 10 has a display digit number of, for example, 10 digits, and in the case of exponent display, the lower three digits display the exponent, and the upper six or seven digits display the mantissa.

Next, the operation of the above embodiment will be explained. In the present invention, the data retention format is IXI<lXl0, and the exponent part is from -99 to
In the range of 99, n digits are displayed for the mantissa, and 2 digits are displayed for the finger 5-base. When the exponent part has three digits, that is, in the range of -999 to -100 and 100 to 999, the mantissa part is n-1 digits and the three digits of the exponent part are displayed. The details will be explained below with reference to the flowchart of FIG. FIG. 4 shows the key operations, the storage state of the register, and the display state of the display section JO when performing the above calculation. First, as shown in FIG. 4 (1) from the key human power section 1, r 1231
rExp'' r49-1, r' 123 J is placed in the mantissa part of the X register 41, and r 49 j is placed in the exponent part. The data held in the X register 4& is sent to the display control section 9 via the arithmetic circuit 6, and the data held in the X register 4& is sent to the display control section 9.
is displayed. Next, in order to perform the square calculation, as shown in Fig. 4 (2), when the "x 1" key operation is performed, the calculation flow shown in Fig. 3 is started. First, the Stellar fS
1, mantissa and exponent processing are performed, and the X register 4a
6- The position of the first digit of the mantissa data r123J held in
9" is increased by +21 to become "51". Also in this case,
The data is shifted so that the decimal point is at the 13th digit of the X register 4a. Next, the process advances to step S2, where the data held in the X register 4a is read out to the arithmetic circuit 6 and x2
Arithmetic processing of -F,! l) r (1,,23xlO),
1 was settled, and the performance result was r1.5129X1
0 J or X register 4 again as shown in Figure 4 (2)
a ILC writing is interrupted. Next, in Stella fS3, the exponent data in X register 4h is 3 digits or less or 3
It is determined whether the number is larger than 3 digits, and if it is larger than 3 digits, it is treated as an error. Further, if the index data is 3 digits or less, the process advances to step S4, and the bill number/digit number determining section 8 determines whether the index data is a narrow loss or a side digit. In this step S4, if it is determined that the exponent number is 3 digits, step S5 is determined.If it is determined that the exponent number is 2 digits, step S6
．． If it is determined that it is a single digit, the process advances to step S7.

In step S5 above, 13 from the 4th digit of the X register 4a.
Sends the 3-digit exponent data of Xo~2 to the display control unit 9, and sends the 3-digit exponent data of Xo~2 to the display control unit 9. If there is a data or not, the data of the lowest digit matches the 5th digit of the display section 10, the lower digit ← 1, and from the 10th digit to the 5th digit of the display section 10, t
-U is displayed in the upper 6 digits. In this case, if the number of digits in the data is greater than the number of display digits (1 to 6 digits), the illusion is -7゛-
The most significant digit of the evening is lowered by matching the most significant digit of the display unit 10, and the lower mapper flow L is rounded down.

The index data is displayed in the 1st and 3rd digits of Kesonobu 1 Kinsuito no 0. In 脣A・, Stella 7'S, the mantissa data of X4 to 13 of the X register 4a and the 2 of XO to 1
Send the exponent data of the digit to the display control section 9 and lower the lower digit where the data of the least significant digit of % , displayed in the upper seven digits of the exchange. In this case, if the number of digits of the data is greater than the number of displayed digits, -r dataft processing and overflow data truncation processing similar to step S5 above are performed. The index data is 1 in Stella 7O84.
If it is determined that the number is a digit and the process proceeds to step S7, the data can be displayed without displaying the exponent, so after processing the decimal point of the mantissa data according to the exponent, the X register is displayed as shown in step S7. The data of X4-13 of 4a is sent to the display control section 9. After the display control section 9 processes the lower digits of the data, it is displayed using all the digits of the display section θ. However, 11tif x
When the calculation process of η is performed, the index number is 102 and is 3 digits, so the process advances from step S4 to step S5, and the display section 10 displays the screen shown in FIG. 4 (2).
As shown in r1. 5129 102'J is displayed. Then, as shown in FIG. 4 (3), when the +1 key is operated, the contents of the X register 4 s3 are transferred to the
transferred to a. Then, as shown in FIG. 4 (4), the next calculation data r 456 j r EXP J r 4
When inputting 91=9-, this calculation is immediately stored in the X register 4a, and r456.49J is displayed on the display section IO. Next, as shown in FIG. 4 (5), when all the keys of rx J are operated, the same process as described above is performed according to the fox Tsutomu flow shown in FIG. That is, in step Sl, the position of the decimal point is moved to the lowest digit by mantissa and exponent processing, and r 4.5
6 x 10 J, and the square calculation is performed in step S3 to obtain the performance result of r2.07936 x 10 1.

Since the index data in this case is 3 digits, step S4
Proceeds to step S5, where the same display process as in the case of FIG. 4 (2) is performed, and r2.0
7936103 J is displayed.

Finally, by operating the [1/-J key, in step S2 in the flow of FIG.
Contents of r t5]29x10. 1 and the guest of X register 4a: r 2.07936 (addition with IXIOJ is performed, and the square root of the Kaga result r 4.7
22975757 x 10'''J is calculated and written to the X register 4thVC.In this case, the exponent 10-data is 2 digits, so from step S4 Stella fS6
Proceed to , and by the display process l'4.72297551
The final result data of j is displayed on the display unit 10.

In the above embodiment, the exponent part is 12'' and 3 digits, but it may be r (1, r51 digits, etc.).

As described above, according to the present invention, the exponent part and the mantissa part are configured fluidly, and the number of displayed digits of the mantissa part is changed according to the number of digits of the exponent data, so that the numerical range that can be displayed is It can be expanded, and calculations that could not be performed using conventional calculation methods can be performed, and can be extremely effective in practice.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a block diagram showing the circuit configuration, FIG. 2 is a diagram showing the detailed configuration of the renostar in FIG. 1, and FIG. 3 is a flownayat diagram showing the operation contents. , and FIGS. 4(1) to 4(6) are diagrams showing changes in the renostar answer and changes in display content due to key operations. 1. Key manual section, 2. Control section, 4. Calculation memory, 7. Exponent part detection section, 8.. 11) Several digit number discrimination section. Applicant's agent Patent attorney Takehiko Suzue Figure 2 Figure 3

Claims (1)

[Claims] Exponent performance - A means for detecting the number of exponent digits in calculation data in a small electronic calculator equipped with the function, and displaying the number of digits of the mantissa data in an arc according to the number of exponent digits detected by this means. %
Index data display method.