#include <stdio.h>
#include <stdlib.h>

typedef struct {
  double re;
  double im;
} complex_t;

void PrintComplex(complex_t val) {
  printf("%lf, %lf\n", val.re, val.im);
}

int main() {
  complex_t a;
  a.re = 0.1;
  a.im = -3.0;
  PrintComplex(a);
  return EXIT_SUCCESS;
}