#include Size makeSize (int width, int height) { Size s = {width, height}; return s; } Size addSize (Size a, Size b) { Size c = {a.width + b.width, a.height + b.height}; return c; } Size subtractSize (Size a, Size b) { Size c = {a.width - b.width, a.height - b.height}; return c; }