#include <stdio.h>

 struct a_xy {
 int x;
 int y;
 };

 struct b_xy {
 int x;
 int y;
 };
 int main(void)
 {
 struct a_xy a = {10, 20};
 struct b_xy b = {30, 40};

 a.x = b.x;
 printf("a.x = %d\n", a.x);

 printf("a.y = %d\n", a.y);

 return 0;
 }