函数名: modf

功 能: 把数分为整数和小数 （The modf function breaks down the floating-point value x into fractional and integer parts, each of which has the same sign as x. The signed fractional portion of x is returned. The integer portion is stored as a floating-point value at intptr.

）

用 法: double modf(double x, double *intptr);

程序例:

#include <math.h>

#include <stdio.h>

int main(void)

{

double fraction, integer;

double number = 100000.567;

fraction = modf(number, &integer);

printf("The whole and fractional parts of %lf are %lf and %lf\",

number, integer, fraction);

return 0;

}