书籍源码

开发平台：

Visual C++

xt12-3-1.cpp：源码内容

							#include <iostream>
using namespace std;
class Point
{public:
  Point(float a,float b):x(a),y(b){}
  ~Point(){cout<<"executing Point destructor"<<endl;}
 private:
  float x;
  float y;
};
class Circle:public Point
{public:
Circle(float a,float b,float r):Point(a,b),radius(r){}
  ~Circle(){cout<<"executing Circle destructor"<<endl;}
 private:
  float radus;
};
int main()
{Point *p=new Circle(2.5,1.8,4.5);
 delete p;
 return 0;
}

						