从Point类继承的Circle类 代码参考

 #include <iostream>
 #include <cstring>

 using namespace std;

 class Point
 {
     private:
         int x,y;
     public:
         Point(int,int);
         void SetPoint(int,int);
         int GetX(){return x;}
         int GetY(){return y;}
         void Print();
 };

 class Circle:public Point
 {
     private:
         double radius;
     public:
         Circle(int,int,double);
         void SetRadius(double);
         double GetRadius();
         double Area();
         void Print();
 };

 void Point::SetPoint(int a, int b)
 {
     x=a;
     y=b;
 }

 Point::Point(int a, int b)
 {
     SetPoint(a,b);
 }

 void Point::Print()
 {
     cout<<"["<<GetX()<<','<<GetY()<<"]"<<endl;
     return;
 }

 Circle::Circle(int a, int b, double r):Point(a,b)
 {
     radius=r;
 }

 void Circle::SetRadius(double r)
 {
     radius=r;
     return;
 }

 double Circle::GetRadius()
 {
     return radius;
 }

 double Circle::Area()
 {
     return 3.14*radius*radius;
 }

 void Circle::Print()
 {
     cout<<"Circle c Center=";
     Point::Print();
     cout<<"Radius="<<radius<<endl;
     cout<<"The centre of circle c ";
     Point::Print();
     cout<<"The area of circle c "<<Area()<<endl;
     return;
 }

 int main()
 {
     int x,y;
     int a,b,r;
     cin>>x>>y>>a>>b>>r;
     Point one(x,y);
     cout<<"Point p ";
     one.Print();
     Circle two(a,b,r);
     two.Print();
     return ;
 }