C++程序设计实验报告(七十二)---第十三周任务四

/* (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

* All rights reserved.

* 文件名称：抽象类CSolid

* 作 者： 刘镇

* 完成日期： 2012 年 05 月 13 日

* 版 本 号： 1.068

* 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>
using namespace std;

const double PI = 3.14159;

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;

CCube ccube(5);
CBall cball(4);
CCylinder ccylinder(10, 2);

p = &ccube;

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

p = &cball;

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

p = &ccylinder;

cout << "圆柱体的表面积是:" << p->area() << endl;
cout << "圆柱体的体积是:" << p->volume() << endl;

system("pause");
return 0;
}

运行结果：