JPH01175060A - Electronic computer - Google Patents

Abstract

PURPOSE:To make it possible to execute numeral working processing such as the change of a display format or rounding processing even on the way of input of a formula by forming a numeral working memory area and the 2nd display part for displaying the contents of said memory area. CONSTITUTION:A numeral working area is formed in a RAM 5 in addition to a memory area for numerical storage or the like formed in a normal computer RAM. When a numeral is inputted, the inputted value is entered to a numeral working area and displayed on the 2nd display part 1b. At the time of inputting an instruction of rounding processing (MDF), an MDF flag is set up, the contents of the 2nd display part 1b are displayed on a display part 1a as they are and inputted to a memory area corresponding to the contents. If said flag is not set up, the contents of the 2nd display part 1b are inputted to the 1st display part 1a and its memory area within the range of effective digits to execute arithmetic processing.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to electronic computers, and particularly to small-sized electronic computers such as character scientific calculators and pocket computers.

(Prior art) In small electronic calculators such as character scientific calculators and pocket computers, input mathematical formulas are temporarily stored in a buffer memory, and the mathematical formulas stored in the buffer memory by operating a predetermined key such as the equal key are stored in the buffer memory. is being interpreted and executed. In such calculators, rounding processing, display digit designation, display format settings (e.g., fixed decimal point display, exponential display), etc. It is designed to allow numerical processing.

The processing of numerical values in a character scientific calculator as an example of a conventional electronic calculator of this type will be explained with reference to FIG. 9th
The figure shows the key operations and the display contents on the display unit when performing the calculation '1.23480÷9'.

Further, the underline in the display contents on the right side of FIG. 9 indicates a cursor.

(1) Enter (80÷9) and store key [STO]
By pressing the [A] key, the second half of the arithmetic expression is calculated. Since the normal display (nor) mode is set, the calculation result is displayed up to the 9th decimal place by rounding off the 10th decimal place, and the calculation result is stored in the A memory.

(2) Process the display format and display digits of the numerical value of the displayed calculation result. In this case, press the display format selection key [PSE] once to select fixed decimal point display (FIX), then press the display digit designation key [TAB] and numeric key [2]. Second decimal place rounded off
The numerical value of the calculation result after processing up to the point is displayed.

rFIX is displayed on the display section.

(3) Press the numeric keys [1], [heat [2], [3] and the plus key [+] to input the first half of the arithmetic expression.

(4) Press the [RCL] key and the [A/] key,
Recall the numerical value stored in memory and perform (2) above.
After processing in the same manner as above, input it into the arithmetic expression.

(5> Press the equal key [=] to calculate the desired expression.

(Problems to be Solved by the Invention) As described above, in conventional computers, numerical processing can be performed only on the numerical values of the calculation results. Therefore,
Numerical processing settings such as display digit designation (TAB) can only be performed in the calculation result display state or clear state.Therefore, even if you want to perform numerical processing processing while inputting a formula, , in the display state of the calculation result, or in the clear state, processing can only be carried out within the preset range of processing. In this way, with conventional calculators, you can specify the display format (PSE) and display digits (
Because it is not possible to perform numerical processing such as changing TAB or rounding (MDF), operations become extremely troublesome when trying to obtain calculation results displayed in the desired format. There were layers.

The present invention is intended to solve the above-mentioned conventional problems, and it is an object of the present invention to provide an electronic computer that can perform numerical processing even while inputting a formula.

(Means for Solving the Problems) The electronic computer of the present invention includes a first display section, a memory area for numerical processing, means for numerically processing the contents of the memory area for numerical processing, and at least a memory area for numerical processing. and a second display section that displays the contents of the memory area for numerical processing, thereby achieving the above object.

(Example) Examples of the present invention will be described below.

FIG. 1 shows the external appearance of a character scientific calculator which is an embodiment of the electronic calculator of the present invention.For the sake of simplicity, FIG.
Mainly, only the keys necessary for the explanation in the liquid crystal display (LCD) 1 and the key operator section 2 are schematically shown, and illustrations of other keys not necessary for the explanation, identification displays of keys, etc. are omitted. There is.

In this embodiment, the liquid crystal display device 1 includes a first display section 1a refined with a dot matrix (12 digits) for displaying input mathematical formulas, etc., and a 7-segment ellipse display section 1a for displaying numerical values. It has a second display section 1b (10 digits for the mantissa and 2 digits for the exponent) and a third display section 1c for displaying numerical processing settings and the like.

A block diagram of the system of this embodiment is shown in FIG. C
The PU3 controls this computer, and the ROM4 stores programs for operating the computer.

Further, the RAM 5 is provided with an area for numerical processing in addition to a memory area for controlling the computer, storing mathematical formulas, etc. provided in the RAM of a normal computer. The liquid crystal drive circuit 6 controls the drive of the liquid crystal display device 1, and the key matrix 7 is for detecting the human power applied to the key force section 2.

In this example, by operating the display format setting [PSE] key, you can select fixed point (FIX) mode, exponential display (
Four types of display modes can be selected: SCI) mode, engineering index display (ENG) mode, and normal display (nor) mode. FIG. 4 shows a flowchart of the display format setting [PSE] key 21. By pressing the [PSE] key 21 once, the above four display modes are selected in sequence (steps 41 to 47), and the selected display mode is displayed on the third display IC (step 48). , see FIG. 3>.In the case of this embodiment, the (nor) mode is not displayed.

FIG. 5 is a flow chart of the display digit designation [TAB] key 22. When the [TAB] key 22 is pressed, the TAB flag is set, and as described later, the display digit is set by inputting the numeric keys.

FIG. 6 is a flowchart of the numeric keys. When the numeric key is pressed, it is determined whether the TAB flag is set (step 61). If the TAB flag is set, display digit setting processing is performed (step 62); if the TAB flag is not set, the process proceeds to step 63, where digit processing is performed and the input The numerical value is entered into the numerical processing area and displayed on the second display section 1b.

A flowchart of the rounding process [MDF] key 22 is shown in FIG. When the [2ndF] key and the [MDF] key 22 are pressed, the MDF flag is set.

A flowchart of the equal [=] key 23 is shown in FIG. 8. When the equal [=] key 23 is pressed, it is determined whether or not the MDF flag is set (step 81). If you are
The contents of the second display section 1b (that is, the contents of the numerical processing area) are input as they are to the first display section 1a (and the corresponding memory area) (step 82), and the MDF flag is not set. In this case, the contents of the second display section 1b are within the range of 10 significant digits of the mantissa part and the content of the first display section 1a is
(and the corresponding memory area) (step 83), arithmetic processing is performed, and the arithmetic results are displayed on the second display section 1b (steps 84-85).

The operation method of this example is as described above, 23+80÷9
'' will be explained using FIG. 3 as an example.

Incidentally, the upper row of the display column on the right side of FIG. 3 shows the display contents of the first display section 1a, the middle row shows the display contents of the second display section 1b, and the lower row shows the display contents of the third display section 1c.

(1) Input the second half of the arithmetic expression (80÷9). The calculation formula is displayed on the first display section 1a, and the calculation result is displayed on the second display section 1b. Since the normal display (nor) mode is set, the calculation result is rounded to the 10th decimal place. The 9th decimal place will be displayed. [STO: Press the l key and °[A] to store the calculation result in the A memory.

(2) Press the numeric keys [1] [, ] [2]' [3] and the plus key [+] to input the first half of the calculation formula; the display on the second display section 1b will be [0] .

(3) Press the [RCL key and the [Al key] to call up the numerical value stored in the A memory and place it in the memory area for numerical processing. The above (1) is displayed on the second display section 1b.
The same number will be displayed.

(4) Press the display format setting [PSE] key 21 once,
Set to fixed-point display (FIX) mode. 0 display digit designation [TA
B] key 22 to set the TAB flag. Next, the numeric key [2] is pressed to perform TAB setting processing, and the processed numerical value, rounded off to the first decimal place, is displayed on the second display section 1b.

(5) Shift key [2ndF] and rounding key [MD
Town 22 is pressed and the MDF flag is set. continue,
When the equal key [・] is pressed, 1. Since the IDF flag is set, the processed numerical value displayed on the second display section 1b is taken into the calculation formula as is, and the first
is displayed on the display section 1a. The calculation is executed and the result is displayed on the second display section 1b.

(Effects of the Invention) As described above, the electronic computer of the present invention can change the display format (PSE) or display digit designation (TAB) or perform numerical processing such as rounding (MDF>) even while inputting a formula. Therefore, according to the electronic computer of the present invention, calculation results displayed in a desired format can be obtained with simple operations.

, -'j@day Fig. 1 is a plan view schematically showing the external appearance of a character scientific calculator which is an embodiment of the present invention, Fig. 2 is a block diagram of the system configuration of the embodiment, and Fig. 3 is its system configuration. An explanatory diagram of an example of key operation in the embodiment, Fig. 4 is a flowchart of the display format setting [PSE] key, Fig. 5 is a flowchart of the display digit specification [TAB] key, and Fig. 6 is a flowchart 1 of the numeric key.・、7th
The figure is a flowchart of the rounding process [MDF] key, and FIG. 8 is a flowchart of the equal [.]l key.

1a...first display section, 1b...second display section, I
C.;・Third display section, 21...Display format setting key,
22...Display digit specification key (rounding process key).

that's all

Claims (1)

[Claims] 1. A first display section, a memory area for numerical processing, means for numerically processing the contents of the memory area for numerical processing, and a second display for displaying at least the contents of the memory area for numerical processing. An electronic computer with a department.