定义三个CShape的派生类CSquare（正方形）

#includeusingnamespacestd;classCShape{public:floatArea;floatPerimeter;CShape(){Area=0;Perimeter=0;}virtualvoidGetArea(){}virtualvoidGetPerimeter(){}};classCRectangle:publicCShape{private:intl;inth;public:CRectangle(inth,intl):CShape(){this->h=h;this->l=l;}voidGetAre