第10周项目一-点-圆-圆柱类的设计

/*
*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：岳成艳2016年5月6号；
*版 本 号：vc++6.0；
*
*问题描述：添加一个类cylinder类，增加数据成员函数h，求表面积，体积。
*程序输入：略；
*程序输出：略；
*/
#include <iostream>
using namespace std;
class Point
{
public:
Point(double x=0,double y=0);                    //构造函数
void setPoint(double,double);                  //设置坐标值
double getX( ) const
{
return x;   //读x坐标
}
double getY( ) const
{
return y;   //读y坐标
}
void show();
protected:                                       //受保护成员
double x,y;
};

//Point的构造函数
Point::Point(double a,double b)
{
x=a;
y=b;
}
//设置x和y的坐标值
void Point::setPoint(double a,double b)
{
x=a;
y=b;
}

void Point::show()
{
cout<<"["<<x<<","<<y<<"]"<<endl;
}

class Circle:public Point   //circle是Point类的公用派生类
{
public:
Circle(double x=0,double y=0,double r=0);  //构造函数
void setRadius(double);                  //设置半径值
double getRadius( ) const;               //读取半径值
double area ( ) const;                   //计算圆面积
void show();
protected:
double radius;
};

//定义构造函数，对圆心坐标和半径初始化
Circle::Circle(double a,double b,double r):Point(a,b),radius(r) { }

//设置半径值
void Circle::setRadius(double r)
{
radius=r;
}

//读取半径值
double Circle::getRadius( ) const
{
return radius;
}

//计算圆面积
double Circle::area( ) const
{
return 3.14159*radius*radius;
}

//输出圆的信息
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);//构造函数
void setHeight(double);                      //设置圆柱高
double getHeight( ) const;                    //读取圆柱高
double area( ) const;                         //计算圆柱表面积
double volume( ) const;                       //计算圆柱体积
void show();
protected:
double height;                               //圆柱高
};

//定义构造函数
Cylinder::Cylinder(double a,double b,double r,double h) :Circle(a,b,r),height(h){}

//设置圆柱高
void Cylinder::setHeight(double h)
{
height=h;
}

//读取圆柱高
double Cylinder::getHeight( ) const
{
return height;
}

//计算圆柱表面积
double Cylinder::area( ) const
{
return 2*Circle::area( )+2*3.14159*radius*height;
}

//计算圆柱体积
double Cylinder::volume() const
{
return Circle::area()*height;
}

void Cylinder::show()
{
cout<<"Center=["<<x<<","<<y<<"], r="<<radius<<", h="<<height
<<"\narea="<<area( )<<", volume="<<volume( )<<endl;
}

int main( )
{
Cylinder cy1(3.5,6.4,5.2,10);
cout<<"\noriginal cylinder:\nx=";
cy1.show();
cy1.setHeight(15);
cy1.setRadius(7.5);
cy1.setPoint(5,5);
cout<<"\nnew cylinder:\n";
cy1.show();
return 0;
}