class Parallelogram
{
private:
Quadrangle quad;
int width, height;
public:
// 构造函数
Parallelogram(std::string tag, int w, int h)
{
quad.tag = tag;
width = w;
height = h;
};
// 复制构造函数
Parallelogram(const Parallelogram &q) : quad(q.quad), width(q.width),
height(q.height){};
~Parallelogram();
double area();
void draw(bool showResult = true);
};