#include Point makePoint (int x, int y) { Point p = {x, y}; return p; } Point addPoint (Point a, Point b) { Point c = {a.x + b.x, a.y + b.y}; return c; } Point subtractPoint (Point a, Point b) { Point c = {a.x - b.x, a.y - b.y}; return c; }