/* (程序头部注释开始)
* 程序的版权和版本声明部分
* Copyright (c) 2011, 烟台大学计算机学院学生
* All rights reserved.
* 文件名称：定义Complex类中的<<和>>运算符的重载，实现输入和输出，改造原程序中对运算结果显示方式，使程序读起来更自然。
* 作 者： 雷恒鑫
* 完成日期： 2012 年 04 月 21 日
* 版 本 号： V1.0
* 对任务及求解方法的描述部分
* 输入描述：
* 问题描述：
* 程序输出：
* 程序头部的注释结束
*/
#include<iostream.h>
#include<Cmath>
#define pi 3.1415926
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 ()
{
cout<<"析构函数执行完毕(Destructor function performs finished)"<<endl;
}
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;
return 0;
}
运行结果：
下面的程序能够看出析构函数的执行过程：
#include<iostream>
using namespace std;
#include<Cmath>
#define pi 3.1415926
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 ()
{
cout<<"Point析构函数执行完毕(Destructor function performs finished)"<<endl;
}
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()
{
cout<<"Circle析构函数执行完毕(Destructor function performs finished)"<<endl;
}
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()
{
cout<<"Cylinder析构函数执行完毕(Destructor function performs finished)"<<endl;
}
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;
}
void f()
{
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;
}
int main()
{
f();
system("pause");
return 0;
}
运行结果：
