class Rectangle: private Point //派生类声明
{
public:
void InitR(float x, float y, float w, float h) {Point::InitP(x,y); W = w; H = h;}
void Move(float xOff, float yOff) {Point::Move(xOff,yOff);}
float GetX() {return Point::GetX();}
float GetY() {return Point::GetY();}
float GetW() {return W;}
float GetH() {return H;}
private:
float W,H;
};
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