#include <stdio.h>

struct point {
    int x;
    int y;
};

int main(void)
{
    struct point pt = {100, 200};
    struct point *p;

    /* Structure */
    printf("(%d, %d)\n", pt.x, pt.y);

    pt.x += 10;
    pt.y += 20;

    printf("(%d, %d)\n", pt.x, pt.y);

    /* Pointer to structure */
    p = &pt;
    (*p).x += 10;
    p->y += 20;

    printf("(%d, %d)\n", (*p).x, p->y);

    return 0;
}