#include <stdio.h>

typedef struct {int i; double d; char c; float f;} st;
typedef union {int i; double d; char c; float f;} un;

int main()
{
  st s;
  un u;
  s.i = u.i = 12345;
  s.d = u.d = 3.141593;
  s.c = u.c = 'A';
  s.f = u.f = 2.718281;
  printf("s.i: %d u.i: %d\n", s.i, u.i);
  printf("s.d: %lf u.d: %lf\n", s.d, u.d);
  printf("s.c: %c u.c: %c\n", s.c, u.c);
  printf("s.f: %f u.f: %f\n", s.f, u.f);
  return 0;
}