定义一个Point类,派生出Rectangle类和Circle类,计算各 派生类对象的面积Area（

定义一个Point类,派生出Rectangle类和Circle类,计算各 派生类对象的面积Area（

#include using namespace std;#define PI 3.14class Point{public:\x09Point() :m_x(0),m_y(0){}\x09Point(double x,double y) :m_x(x),m_y(y){}\x09~Point(){}protected:\x09double m_x;\x09double m_y;};class Rectangle :public Point{public:\x09Rectangle() :Point(){}\x09Rectangle(double x,double y) :Point(x,y){}\x09~Rectangle(){}\x09double Area()\x09{\x09\x09return m_x * m_y;\x09}};class Circle :public Point{public:\x09Circle() :m_r(0){}\x09Circle(double r) :m_r(r){}\x09~Circle(){}\x09double Area()\x09{\x09\x09return PI * m_r * m_r;\x09}private:\x09double m_r;};int main(){\x09Rectangle rect(3.2,2.1);\x09Circle circle(5.1);\x09cout

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