C语言库modf()函数

#include<stdio.h>
#include<math.h>

int main () {
   double x, fractpart, intpart;

   x = 8.123456;
   fractpart = modf(x, &intpart);

   printf(Integral part = %lf\n, intpart);
   printf(Fraction Part = %lf \n, fractpart);

   return(0);
}