JPH01217622A - Conversion system for expression of floating point - Google Patents

Abstract

PURPOSE:To realize the conversion of expression in a short time without limiting the value to be converted by converting the expression of a floating point, i.e., the internal expression of a real number of a computer into an expression based on each hardware. CONSTITUTION:The value (hexadecimal) to be converted as well as the radix and the digit number of an exponent part of the expression of said hexadecimal value are read and then the radix and the digit number of the exponent part of the converted expression are read. The specific decimal value equivalent to the unconverted value is calculated and an exponent part is calculated from said obtained value based on the radix of the expression of the conversion number. Then a mantissa part is obtained and the data on the conversion number is delivered in a hexadecimal form. In other words, the value to be converted and its data 21 are converted into a decimal expression 22. Then the conversion of expression is performed based on a converted format 23. Thus it is not required to produce a conversion program for each hardware when data are transferred between different types of hardware.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to the internal representation of numerical values handled by a computer.

[Conventional technology]

The representation method of floating point numbers differs depending on the hardware, so when transferring numbers between different hardware,
The numbers after transfer may be interpreted as different from the numbers before transfer.

For this reason, when data is transferred between hardware with different floating point representation methods, a programmer creates a representation conversion program according to each hardware.

[Problem to be solved by the invention]

Conventional floating-point representation conversion methods require programmers to create and execute programs for each hardware because the floating-point representation method differs depending on the hardware, which takes time. There were problems such as it was time-consuming and the program lacked versatility.

This invention was made to solve the above-mentioned problems, and the purpose is to obtain a floating-point representation conversion method that does not limit the value to be converted and can convert the representation in a short time. .

[Means to solve the problem]

The floating point representation conversion method according to the present invention calculates the converted data by inputting a numerical value to be converted, its floating point representation format, and the converted representation format.

[Effect]

The floating-point representation conversion system of the present invention can easily perform floating-point representation conversion when data is transferred between different eight-way hardware.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, read the value you want to convert (hexadecimal value) and the base number and number of digits of the exponent part of its expression (step 1), then read the base number and number of digits of the exponent part of the expression after conversion (step 2). ). It is calculated what the value before conversion corresponds to in decimal value (step 3). From the obtained value, calculate the exponent part based on the radix of the converted expression, and then calculate the mantissa part (
Step 4). Output the converted data in hexadecimal.

FIG. 2 is an explanatory diagram showing the flow of the conversion method of the present invention using concrete floating point representation.

In the figure, the value to be converted and its data (goods) are converted into decimal representation, and the expression conversion is performed based on the converted format. [Effect of the invention] As described above, according to this invention, the value to be converted is converted into a decimal representation. By reading the floating-point representation along with its representation format and converting it to the desired representation format, there is an advantage that when data is transferred between different hardware, there is no need to create a conversion program for each piece of hardware. There is.

[Brief explanation of the drawing]

Figure 1 is a flowchart for explaining the invention in detail;
The figure is an explanatory diagram illustrating an embodiment of the floating-point representation conversion method according to the present invention.

Claims (1)

[Claims] A conversion method for floating point representation, which is characterized by converting floating point representation, which is the internal representation of real numbers in a computer, into a representation suitable for each hardware.