第十三周实验报告（4）

/* 程序头部注释开始
* 程序的版权和版本声明部分
* Copyright (c) 2012, 烟台大学计算机学院学生
* Copyright (c) 2012, 烟台大学计算机学院学生
* All rights reserved.
* 文件名称：                        
* 作    者：        李瑞                  
* 完成日期：  2012 年 5月 16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*/

/*【任务4】设计一个抽象类CSolid，含有两个求表面积及体积的纯虚函数。设计三个派生类CCube、CBall、
CCylinder，分别表示正方体、球体及圆柱体。在main()函数中，定义基类的指针p(CSolid *p;)，
利用p指针，输出正方体、球体及圆柱体对象的表面积及体积。*/

#include<iostream>
using namespace std;

const double PI = 3.1415926;

class CSolid
{
public:
virtual double area() const =0;
virtual double volume() const =0;
};

class CCube: public CSolid
{
public:
CCube(double length);
virtual double area() const;
virtual double volume() const;
void show_area();
void show_volume();
protected:
double length;
};

class CBall: public CSolid
{
public:
CBall(double radius);
virtual double area() const;
virtual double volume() const;
protected:
double radius;
};

class CCylinder: public CSolid
{
public:
CCylinder(double height, double radius);
virtual double area() const;
virtual double volume() const;
void show_area();
void show_volume();
protected:
double height;
double radius;
};

CCube::CCube(double length)
{
this->length = length;
}

double CCube::area() const
{
return (this->length * this->length * 6);
}

double CCube::volume() const
{
return (this->length * this->length * this->length);
}

CBall::CBall(double radius)
{
this->radius = radius;
}

double CBall::area() const
{
return (4 * PI * this->radius * this->radius);
}

double CBall::volume() const
{
return (PI * this->radius * this->radius * this->radius * 3 / 4);
}

CCylinder::CCylinder(double height, double radius)
{
this->height = height;
this->radius = radius;
}

double CCylinder::area() const
{
return (2 * (PI * this->radius * this->radius) + this->height * (2 * PI * this->radius));
}

double CCylinder::volume() const
{
return (PI * this->radius * this->radius * this->height);
}

int main()
{
CSolid *p;

double length;
length = 10 ;
CCube ccube(length);

double radius;
radius = 10;
CBall cball(radius);

double c_height, c_radius;
c_height = 1 ;
c_radius = 10 ;
CCylinder ccylinder(c_height, c_radius);

p = &ccube;

cout << "棱长为 " <<  length  <<" 的正方体的表面积是:" << p->area() << endl;
cout << "体积是:" << p->volume() << endl << endl;

p = &cball;

cout << "半径为 " <<  radius  << " 的球体的表面积是:" << p->area() << endl;
cout << "体积是:" << p->volume() << endl << endl;

p = &ccylinder;

cout << "高为 " << c_height << " ,底面半径为 " << c_radius << "  的圆柱体的表面积是:" << p->area() << endl;
cout << "体积是:" << p->volume() << endl;

system("pause");
return 0;
}