p407 虚析构函数.cpp

谭浩强 《C++ 程序设计》第三版的部分课后练习题源码

#include<iostream>
using namespace std;
class Shape
{
      public:
      Shape(){}
      virtual ~Shape(){  cout<<"the fatherbase distructor "<<endl; }
      
};   

class Point:public Shape
{
      public:
      Point(){}
      ~Point(){cout<<"the first-sonbase distructor "<<endl; }
};        
      
class Circle:public Point
{
      public:
      Circle(){}
      ~Circle() {cout<<"the second-sonbase distructor "<<endl;}
      
};   

int main()
{
    Shape *p=new Point;
    delete p;
    
    system("pause");
     return 0;    
    
    
    }