编辑代码

#include<iostream>
using namespace std;
class Point     //定义基类Point类
{public:
  Point(){}                                                   //Point类构造函数
  ~Point(){cout<<"executing Point destructor"<<endl;}         //Point类析构函数
};

class Circle:public Point                                     //定义派生类Circle类
{public:
  Circle(){}                                                 //Circle类构造函数
  ~Circle(){cout<<"executing Circle destructor"<<endl;}      //Circle类析构函数
 private:
  int radus;
};

int main()
{ 
    Point *p=new Circle;                             //用new开辟动态存储空间
    delete p;                                        //用delete释放动态存储空间
    return 0;
}