2012年 上半年 第十周 C++程序设计 （三十三）

#include<Cmath>
#define pi 3.1415926
using namespace std;

class Point //定义坐标点类
{
public:
double x,y; //点的横坐标和纵坐标
Point(){x=0;y=0;}
Point(double x0,double y0) {x=x0; y=y0;}
~Point ()
{
system("pause");
}
double get_x(){return x;}
double get_y(){return y;}
friend ostream &operator << (ostream & output, Point & c);
};

class Circle: public Point //利用坐标点类定义圆类, 其基类的数据成员表示圆的中心
{
private:
double d;
public:
Circle(double xx,double yy,double dd): Point(xx,yy) ,d(dd){} //构造函数
~Circle()
{
}
friend ostream &operator << (ostream & output, Circle & c);
double get_d(){return d;}
};

class Cylinder: public Circle
{
private:
double h;
public:
Cylinder(double xx,double yy,double dd,double hh): Circle (xx,yy,dd),h(hh){} //构造函数
~Cylinder()
{
}
friend ostream &operator << (ostream & output,Cylinder & c);
double get_h(){return h;}
double superficial_area(); //表面积
double volume(); //体积
};

ostream &operator << (ostream & output, Point & c)
{
output<<"点的横坐标为："<<c.x<<"     "<<"点的纵坐标为："<<c.y<<endl;
return output;
}

ostream &operator << (ostream & output, Circle & c)
{
output<<"圆的半径为："<<c.get_d()<<"圆的圆心为"<<"("<<c.get_x()<<","<<c.get_y()<<")"<<endl;
return output;
}

ostream &operator << (ostream & output,Cylinder & c)
{
output<<"圆的高为："<<c.get_h()<<"圆的半径为："<<c.get_d()<<"圆的圆心为"<<"("<<c.get_x()<<","<<c.get_y()<<")"<<endl;
return output;
}

double  Cylinder::superficial_area() //表面积
{
double s;
s=2*pi*get_d()*get_d()+2*pi*get_d()*get_h();
return s;
}

double  Cylinder::volume() //体积
{
double v;
v=pi*get_d()*get_d()*get_h();
return v;
}

int main()
{
Point p(1,1);
cout<<p;
Circle ci(1,2,6);
cout<<ci;
Cylinder cy(1,2,3,4);
cout<<cy;
cout<<"圆柱的体积为："<<cy.volume ()<<endl;
cout<<"圆柱的表面积为："<<cy.superficial_area ()<<endl;
system("pause");
return 0;
}

点的横坐标为：1     点的纵坐标为：1
圆的半径为：6圆的圆心为(1,2)
圆的高为：4圆的半径为：3圆的圆心为(1,2)
圆柱的体积为：113.097
圆柱的表面积为：131.947
请按任意键继续. . .