frexp

函数名: frexp

功 能: 把一个双精度数分解为尾数的指数

用 法: double frexp(double value, int *eptr);

程序例:

#include <math.h>

#include <stdio.h>

int main(void)

{

double mantissa, number;

int exponent;

number = 8.0;

mantissa = frexp(number, &exponent);

printf("The number %lf is ", number);

printf("%lf times two to the ", mantissa);

printf("power of %d

", exponent);

return 0;

}