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

struct A
{
  int x;
} var_global;
struct B
{
  int y;
};

int main()
{
  /* Case 1. Casting of heap address. */
  struct A *var_local1 = (struct A *)malloc(sizeof(struct A));
  struct B *var_local2 = (struct B *)var_local1;
  printf("The same addresses of different fields of different structures: %p %p\n", &var_local1->x, &var_local2->y);

  /* Case 2. Casting of global variable address. */
  var_local2 = (struct B *)&var_global;
  printf("The same addresses of different fields of different structures: %p %p\n", &var_global.x, &var_local2->y);

  return 0;
}