struct test {
  void * ptr;
}

struct test * create_test (void * ptr) {
  struct test * t;

  t = malloc(sizeof(struct test));

  t->ptr = ptr;
  printf("create_test : t->ptr = %pn", t->ptr);

  return t;
}

int main() {
  struct test * t;
  int num;

  num = 5;

  t = create_test((void *) &num);
  printf("main : t->ptr = %pn", t->ptr);

  return 0;
}