6.14

#include<iostream>
using namespace std;
const double pi=3.14;
class container{
protected:
	double r;
public:
	container(double radius)
	{
		r=radius;
	}
	virtual double surface_area()=0;
	virtual double volume()=0;
};
class cube:public container{
public:
	cube(double radius):container(radius)
	{};
	double surface_area()
	{
		return 6.0*r*r;
	};
	double  volume()
	{
		return r*r*r;
	}
};
class sphere:public container{
public:
	sphere(double radius):container(radius)
	{};
	double surface_area()
	{
		return 4*pi*r*r;
	};
	double  volume()
	{
		return pi*r*r*r*4/3;
	}
};
class cylinder:public container{
protected:
	double h;
public:
	cylinder(double radius,double high):container(radius)
	{
	h=high;
	};
	double surface_area()
	{
		return 2*pi*r*(r+h);
	};
	double  volume()
	{
		return pi*r*r*h;
	}
};
int main()
{
	container *p;
	cube cu(6.0);
	sphere sp(5.0);
	cylinder cy(5.0,6.0);
	p=&cu;
	cout<<"正方体的表面积为:"<<p->surface_area()<<endl;
	cout<<"正方体的体积为:"<<p->volume()<<endl;
	p=&sp;
	cout<<"球体的表面积为:"<<p->surface_area()<<endl;
	cout<<"球体的体积为:"<<p->volume()<<endl;
	p=&cy;
	cout<<"圆柱体的表面积为:"<<p->surface_area()<<endl;
	cout<<"圆柱体的体积为:"<<p->volume()<<endl;
	system("pause");
	return 0;
}