ex11-1.c

#include <stdio.h>

void intfrac(double input, int *ipart, double *dpart) {
  int i = (int)input;
  double d = (double)input - i;
  ipart = &i;
  dpart = &d;
}

int main() {
  int *ipart = 0;
  double *dpart = 0, input;
  printf("> ");
  scanf("%lf", &input);
  intfrac(input, ipart, dpart);
  printf("%lf = %d + %lf\n", input, *ipart, *dpart);
}