第十一周项目4- 类族的设计

/* *Copyright (c) 2014, 烟台大学计算机学院 *All rights reserved. *文件名称：week11-4.cpp *作者：高赞 *完成日期：2015年 5 月 18 日 *版本号：v1.0 * * */#include <iostream>using namespace std;class Point //定义坐标点类{public:    Point(double x0=0, double y0=0):x(x0), y(y0) {}    double getx()    {        return x;    }    double gety()    {        return y;    }protected:    double x,y;   //点的横坐标和纵坐标};class Circle:public Point{public:    Circle(double x0=0,double y0=0,double r0=0):Point(x0,y0),r(r0) {}    double area()    {        return 3.141592*r*r;    }    double getr()    {        return r;    }private:    double r;};class Cylinder:public Circle{public:    Cylinder(double x0=0,double y0=0,double r0=0,double h0=0):Circle(x0,y0,r0),h(h0) {}    double volume()    {        return h*area();    }    double geth()    {        return h;    }    friend ostream &operator<<(ostream &put,Cylinder &c)    {        put<<"底面圆心：("<<c.getx()<<","<<c.gety()<<")"<<endl           <<"底面半径："<<c.getr()<<"  高："<<c.geth()<<endl           <<"底面积："<<c.area()<<endl           <<"体积："<<c.volume()<<endl;        return put;    }private:    double h;};int main(){    Cylinder a(1,1,2,5);    cout<<a<<endl;    return 0;}