float.c

linux下的Ｃ语言开发

/*-*/
/********************************************************
 * Name: Accuracy					*
 *							*
 * Purpose: Computes the accuracy of the floating	*
 *	point numbers in storage and calculations.	*
 *							*
 * Usage: Run it and get the results.			*
 *							*
 * Notes: There are much more scientific and accurate	*
 *	ways of doing this.				*
 ********************************************************/
/*+*/
#include <stdio.h>
int main()
{
    /* two numbers to work with */
    float number1, number2;
    float result;               /* result of calculation */
    int   counter;              /* loop counter and accuracy check */

    number1 = 1.0;
    number2 = 1.0;
    counter = 0;

    while (number1 + number2 != number1) {
        ++counter;
        number2 = number2 / 10.0;
    }
    printf("%2d digits accuracy in calculations\n", counter);

    number2 = 1.0;
    counter = 0;

    while (1) {
        result = number1 + number2;
        if (result == number1)
            break;
        ++counter;
        number2 = number2 / 10.0;
    }
    printf("%2d digits accuracy in storage\n", counter);
    return (0);
}