2015年大一下第8周项目3-类族的设计

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/**Copyright (c) 2014,烟台大学计算机学院*All rights reserved.*文件名称:Annpion.cpp*作者:王耀鹏*完成日期:2015年5月14日*版本号:v1.0**问题描述:由基类的设计和测试开始，逐渐地完成各个类的设计，求出圆格柱体的表面积、体积并输出并且完成要求的计算任务。*输入描述:无。*输出描述:圆柱体的表面积，体积等信息。*/#include<iostream>using namespace std;class Point{public:    Point(double a,double b):x(a),y(b) {};    double getx();    double gety();    void setXY(double a,double b);    friend ostream &operator <<(ostream &out,Point &p);protected:    double x,y;};double Point::getx(){    return x;}double Point::gety(){    return y;}void Point::setXY(double a,double b){    x=a;    y=b;}ostream &operator <<(ostream &out,Point &p){    cout<<"("<<p.x<<","<<p.y<<")"<<endl;    return out;}class Circle:public Point{public:    Circle(double a,double b,double c):Point(a,b),r(c) {};    double area();    double getR();    void setR(double a);    friend ostream &operator <<(ostream & out ,Circle &c);protected:    double r;};double Circle::area(){    return 3.1415926*r*r;}double Circle::getR(){    return r;}void Circle::setR(double a){    r=a;}ostream &operator <<(ostream & out ,Circle &c){    cout<<"该圆是以"<<"("<<c.x<<","<<c.y<<")为圆心，"<<c.r<<"为半径的圆。该圆的面积为："<<c.area()<<endl;    return out;}class Cylinder:public Circle{public:    Cylinder(double a,double b,double c,double d):Circle(a,b,c),h(d) {};    double Sarea();    double volume();    double getH();    void setH(double a);    friend ostream &operator <<(ostream &out ,Cylinder &c);private:    double h;};double Cylinder::Sarea(){    return 3.1415926*2*r*h+3.1415926*r*r*2;}double Cylinder::volume(){    return 3.1415926*r*r*h;}double Cylinder::getH(){    return h;}void Cylinder::setH(double a){    h=a;}ostream &operator<<(ostream &out ,Cylinder &c){    cout<<"该圆柱是以"<<"("<<c.x<<","<<c.y<<")为中心,"<<c.r<<"为半径,"<<c.h<<"为高的圆柱体。该圆柱体的表面积为："<<c.Sarea()<<",体积为："<<c.volume()<<endl;    return out;}int main( ){    Cylinder cy1(3.5,6.4,5.2,10);    cout<<"\noriginal cylinder:\nx="<<cy1.getx( )<<", y="<<cy1.gety( )<<", r="        <<cy1.getR( )<<", h="<<cy1.getH( )<<"\narea="<<cy1.Sarea()        <<",volume="<<cy1.volume()<<endl;    cy1.setH(15);    cy1.setR(7.5);    cy1.setXY(5,5);    cout<<"\nnew cylinder:\n"<<cy1;    return 0;}
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