JPS58189759A - Electronic computer for financial calculation - Google Patents

Abstract

PURPOSE:To facilitate the input/output during an operation, by using an automatic constant multiplication/division indication key to perform the multiplication/division of a prescribed constant. CONSTITUTION:Each variable input key 3 is used to feed a data, and an arithmetic indication key 2 is supplied. Then each variable is calculated and sent to an X register for display. When the key 3 for monthly interest im is pushed, it is decided whether a constant multiplication/division key 4 is pushed while looking at a flag 8. When the key 4 is pushed, the contents of the X register are multiplied by 12 times. While the contents of the X register are divided by 12 to obtain the period month number Nm. If the key 2 is not applied, the value of the X register is supplied. When the key 3 for the interest im is pushed, the value obtained by dividing the contents of the X register is fed to the X register while looking at the flag 8. While the value obtained by multiplying the contents of the X register by 12 times is fed to the X register when the key 3 is pushed. Then each variable is sent to each register for display.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic computer for financial calculations that can automatically perform constant multiplication or division.

When performing financial calculations, it is common to use monthly units as the minimum unit of calculation period. On the other hand, the values usually displayed are in years.

For this purpose, the interest rate is calculated by dividing the annual interest rate by 12, converting it into a monthly interest rate, inputting it, performing financial calculations, and multiplying the result by 12 to return the annual interest rate. Also, if you want to use seven people for a yearly period, multiply by 4112, convert it to the number of months, and enter the calculation result as 12.
Find the number of years by dividing by ℃. Conventional electronic computers have the drawback of being cumbersome to operate, since they perform this trick 12 times or 1/12 times. Also, 12 times, 1/1
There are some methods that simplify the above calculations by using keys that have double the functions, but even in this case, it is only easy to set the numerical value, and the drawback that the steps before and after the calculation are still troublesome still remains. Ta.

The present invention is based on the above-mentioned points, and by providing self IIjJ constant multiplication/division instruction keys,
The purpose is to provide an electronic meter for financial calculations that facilitates input and output during oil collection. The present invention will be explained below with reference to the drawings.

The first example is a block diagram showing an embodiment of the present invention.

In this figure, 1 is a group of keys used in ordinary electronic 1'1' calculators, 2 is a calculation S instruction key for calculating unknown numbers, 3 is a manual variable key for financial calculations, Pv is the principal amount, FV is the principal and interest rate needle, i,, is the monthly interest rate, N is the number of months in the period, 4 is the key for constant multiplication and division, 5 is the performance 31L
fllI control unit, 6 is a display unit, 7 is the calculation instruction key 2
8 is a flag that is set when the constant multiplication/division key 4 is pressed.

Prior to explaining the operation of the above embodiment, compound interest calculation will be explained 17B.

As a theoretical formula, the monthly interest rate is 11%, the number of months in one period is N, and the principal amount is P.
If the principal and interest needle after the number of months in the v2 period is FV, then FV=pH
+-'-)" 00 1--member PV=FV (1+-) 00"- + m: ((P'v/PV)" 1)
X 100Nrn21ll (FV/PV)/1.
(1+ −)00.

Therefore, if three of the four variables are known, the other variable can be easily determined from the above equation.

By the way, conventional electronic computers for financial calculations do not have the constant multiplication/division keys 4 shown in the embodiment of FIG. If the annual interest rate is 3 years, the key operation is as shown in Figure 3 (a
) K.

Note that the reference numeral 11 in FIG. 3 is a key. On the other hand, in this invention, the key operation is as shown in FIG. 3(b)K, and 1
``8% annual rate'', 13 years'' allows for more intuitive human power. If the IYI key is omitted, constant multiplication and division will naturally not be performed, and the result will be the same as in the conventional example.

Conversely, for the calculation result, the answer is the number of months Nm = 3
61 When the period interest rate 1-=0.667 (%), the number of years and the annual interest rate are calculated as shown in Figure 4 (a) in the conventional example, but according to this invention, the number of years and annual interest rate are calculated as shown in Figure 4 (b become,
Simpler and more intuitive human power is possible.

Next, the operation of the embodiment shown in FIG. 1 will be explained using the flow chart shown in FIG. In addition, in Fig. 2, calculation instruction key 2
0 function [compj, constant multiplication/division key 4 tangent to rY
J, and rXJ indicates what is stored in the X register. The flowchart in FIG. 2 shows the flow after inputting data using the variable input keys 3 while the data is in the X register.

Now, when the computation instruction key 2 (comp) is input, each variable is computed, sent to the X register, and displayed. Here, when the variable input key 3 for monthly interest rate 11 is pressed, check the flag ・, and then press the constant multiplication/division key 4.
Determine if (Y) is pressed or not, and if it is pressed...
If so, multiply the contents of the X register by 12. In addition, in the case of the period number of months N, the value is divided by 12.

In the above, if the calculation instruction key 1 (comp) is not input, the values of the X register are input as each variable, but the monthly interest rate 1. When the variable input key 3 is pressed, the flag S is further checked and the value divided by 12 is entered into the X register. If the variable input key 3 for the number of months Nff1 is pressed, the value multiplied by 12 is entered into the X register. Then, each variable is sent to each register and displayed, and the process ends.

As explained in detail above, the present invention provides an automatic constant multiplication/division instruction key that is operated prior to the operation of the manual instruction key and the output instruction key, and multiplies or divides a predetermined constant by operating the automatic constant multiplication/division instruction key. This has the advantage that input/output such as period rate of 2 years, etc. is extremely easy.

[Brief explanation of drawings]

FIG. 1 is a boot diagram showing an embodiment of the present invention.
The drawings are a two-chart for explaining the operation of the embodiment shown in FIG. 1, FIGS. 3(a) and 3(b) are diagrams showing the conventional key operation procedure and an example of the key operation middle piece of the present invention, and FIG. (a),
(b) is a diagram illustrating another conventional key operation procedure and an example according to the present invention. In the figure, 1 is a group of keys, 2 is a calculation instruction key, 3 is a variable manual key, 4 is a constant multiplication/division key, 5 is a calculation system # section, ε is a display section, and 7 and 8 are flags. Y: Re5et 1 Figure 3 (a) l Rorororo (year*/12-monthly interest*) Ro --- (11λ months) l Rorororo ('4 x 12-ritsu) Ko --- (number of months) Input) (b) Koro Loco Mouth -1-(lλka) [Kuchi 5 Ko [Ko m--(Hayabusa Sanjuh) 4th- (a) Kuchi=Kororororo (b) □口□口

Claims (1)

[Claims] An automatic constant multiplication/division instruction key that is operated prior to the operation of the variable input instruction key and output instruction key in an electronic computer that performs financial calculations and is equipped with a variable input instruction key and an output instruction key; 1. An electronic IT machine for financial calculations, characterized in that it is provided with a limiting means for multiplying or dividing by a predetermined constant and inputting or outputting the result when the is operated.