#include <stdio.h>

struct point_tag {
        int x;
        int y;
};

typedef struct point_tag Point;

int main(void) 
{
      Point pt[] = { {10,20}, {30, 40}, {50,60}};
      pt[0] = (Point){100,200};
      printf("%d %d\n", pt[0].x, pt[0].y);
      return 0;
}