/*
 * struct-param-pointer.c
 */

struct point {
    int x;
    int y;
};

int dist_squared(struct point *p1, struct point *p2);
int dist_squared_better(struct point *p1, struct point *p2);

int main(int argc, char *argv[])
{
    struct point a, b;
    float d;

    a.x = 0;
    a.y = 0;

    b.x = 4;
    b.y = 3;

    d = dist_squared(&a, &b);
}

int dist_squared(struct point *p1, struct point *p2)
{
    int dx, dy;

    dx = (*p1).x - (*p2).x;
    dy = (*p1).y - (*p2).y;

    return dx * dx + dy * dy;
}

int dist_squared_better(struct point *p1, struct point *p2)
{
    int dx, dy;

    dx = p1->x - p2->x;
    dy = p1->y - p2->y;

    return dx * dx + dy * dy;
}