#include <stdio.h>
void decompose(double, long *, double *);

int main() {
  long mp;
  double rm;
  double x = 3.141234;
  printf("%ld, %f\n", mp, rm);
  decompose(x, &mp, &rm);
  printf("%ld, %f\n", mp, rm);
}

void decompose(double x, long *int_part, double *frac_part) {
  *int_part = (long)x;
  *frac_part = x - *int_part;
}