第10，11周 项目一（3）

/**Copyright (c)2016,烟台大学计算机与控制工程学院*All rights reserved.*文件名称：main.cpp*作    者：肖雪*完成日期：2016年5月17日*版 本 号：v1.0*问题描述：再以Circle类为直接基类，派生出一个Cylinder(圆柱体)类，再增加数据成员h(高)，，*          以及求圆柱表面积的成员函数area和求圆柱体积的成员函数volume，实现需要的成员函数，并设计main函数完成测试。*/#include <iostream>using namespace std;class Point{public:    Point(double x=0,double y=0);    void show();protected:    double x,y;};Point::Point(double a,double b){    x=a;    y=b;}void Point::show(){    cout<<"["<<x<<","<<y<<"]"<<endl;}class Circle:public Point{public:    Circle(double x=0,double y=0,double r=0);    double area ( );    void show();protected:    double radius;};Circle::Circle(double a,double b,double r):Point(a,b),radius(r) { }double Circle::area( ){    return 3.14159*radius*radius;}void Circle::show(){    cout<<"Center=("<<x<<", "<<y<<"), r="<<radius<<", area="<<area( )<<endl;}class Cylinder:public Circle{public:    Cylinder(double x=0,double y=0,double r=0,double h=0);    double area();    void show();    double volume();protected:    double height;};Cylinder::Cylinder(double a,double b,double r,double h):Circle(a,b,r),height(h){}double Cylinder::area(){    return 2*Circle::area()+2*3.14159*radius*height;}double Cylinder::volume(){    return Circle::area()*height;}void Cylinder::show(){    cout<<"圆心：["<<x<<","<<y<<"], r="<<radius<<", h="<<height<<"\narea="<<area( )<<", volume="<<volume( )<<endl;}int main( ){    Cylinder c(1.3,1.4,5.2,10);    c.area();    c.volume();    c.show();    return 0;}