第十一周-类族的设计

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   （提示：此任务可以分为三个子任务分成若干步骤进行。先声明基类，再声明派生类，逐级进行，分步调试。——这种方法适用于做任何的项目）

#include <iostream>
using namespace std;
class Point
{
protected:
    double x,y;
public:
Point(double x0,double y0):x(x0),y(y0){}
double get_x()
{
    return x;
}
double get_y()
{
    return y;
}
void PrintPoint();
};
void Point::PrintPoint()
{
    cout<<"Point: ("<<x<<","<<y<<")"<<endl;    //输出点
}
class Circle: public Point
{
protected:
    double r;
public:
    Circle(double a,double b,double c):Point(a,b),r(c){}
    double set_r();
    double Circle_area();
};
double Circle::set_r()
{
    cout<<"请输入圆的半径：";
    cin>>r;
}
double Circle::Circle_area()
{
    return 3.14*r*r;
}
class Cylinder:public Circle
{
protected:
    double h;
public:
    Cylinder(double a,double b,double c):Circle(a,b,c){}
    double set_h();
    double Cylinder_area();
    double Cylinder_volume();
};
double Cylinder::set_h()
{
    cout<<"请输入圆柱体的高：";
    cin>>h;
}
double Cylinder::Cylinder_area()
{
    return (2*3.14*r*r+2*3.14*r*h);
}
double Cylinder::Cylinder_volume()
{
    return 3.14*r*r*h;
}
int main()
{
  Cylinder cd(2.0,5.0,3.0);
  cd.set_r();
  cout<<"圆的面积为："<<cd.Circle_area()<<endl;
  cd.set_h();
  cout<<"圆柱体的表面积为:"<<cd.Cylinder_area()<<endl;
  cout<<"圆柱体的体积为:"<<cd.Cylinder_volume();
}

第十一周-类族的设计

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原文地址：http://blog.csdn.net/zs9528/article/details/46053951