#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);
	
	//a = b;
	printf("a.y = %d\n",a.y);
	
	return 0;
}