第十三周实验报告（四）

#include <iostream>
#include <cmath>
const double  pi = 3.1415926;
using namespace std;
class CSolid
{
public:
virtual double area ()=0;
virtual double volume() =0;
};
class CCube:public CSolid
{
private:
double length;
public :
virtual double area();
virtual double volume();
CCube(double length);
~ CCube(){};
};
class CBall:public CSolid
{
private:
double radius;
public :
virtual double area();
virtual double volume();
CBall(double radius);
~CBall(){};
};
class CCylinder:public CSolid
{
private:
double radius;
double height;
public :
virtual double area();
virtual double volume();
CCylinder(double radius,double height);
~CCylinder(){};
};
double CCube::area()
{
return pow(this->length,2)*6;
}
double CCube::volume()
{
return pow(this->length,3);
}
CCube::CCube(double length)
{
this -> length = length;
}

double CBall::area()
{
return (4*pi*(pow(this->radius,2)));
}
double CBall::volume()
{
return (4/3)*pi*(pow(this->radius,3));
}
CBall::CBall(double radius)
{
this->radius = radius;
}

double CCylinder::area()
{
return (pow(this->radius,2)*2*pi+2*pi*this->radius*this->height);
}
double CCylinder::volume()
{
return pi*pow(this->radius,2)*this->height;
}

CCylinder::CCylinder(double radius,double height)
{
this -> radius = radius;
this -> height = height;
}
int main()
{
CCube CCube1(12.6);    //建立CCube类对象c1,参数为正方体边长
CBall CBall1(4.5);       //建立CBall1类对象CBall1,参数为球的半径
CCylinder CCylinder1(4.5,8.4);    //建立CCylinder类对象CCylinder1，参数为圆柱体的半径和高
CSolid *p;
p=&CCube1;
cout<<"totol of CCube areas="<<p->area()<<endl;   //输出表面积
cout<<"totol of CCube volume="<<p->volume()<<endl;   //输出体积
p=&CBall1;
cout<<"totol of CBall areas="<<p->area()<<endl;   //输出表面积
cout<<"totol of CBall volume="<<p->volume()<<endl;   //输出体积
p=&CCylinder1;
cout<<"totol of CCylinder areas="<<p->area()<<endl;   //输出表面积
cout<<"totol of CCylinder volume="<<p->volume()<<endl;   //输出体积
delete p;
system("pause");
return 0;
}