modf

modf

功 能: 把数分为整数和小数

#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\n",number, integer, fraction);return 0;}

The whole and fractional parts of 100000.567000 are 100000.000000 and 0.567000