#include <stdio.h>

struct alpha { int x; int y; };
struct beta { int x; int y; };
struct gamma { int c; int d; };
  
int main()
{
  struct alpha a1, a2;
  struct beta b1;
  struct beta *bp;
  a1.x = 2;
  a1.y = 3;
  printf("a1: (%d,%d)\n", a1.x, a1.y);
  a2 = a1;
  printf("a2: (%d,%d)\n", a2.x, a2.y);
  a1.x = 5;
  printf("a1: (%d,%d)\n", a1.x, a1.y);
  printf("a2: (%d,%d)\n", a2.x, a2.y);
  bp = (struct beta *) &a1;
  b1 = *bp;
  printf("b1: (%d,%d)\n", b1.x, b1.y);

  exit(0);
} /* main() */