6.13

#include<iostream>
using namespace std;
const double pi=3.14;
class Base{
protected:
	double h;
public:
	Base(double high)
	{
		h=high;
	};
	virtual double disp()=0;
};
class Cuboid:public Base{
protected:
	double l;
	double w;
public:
	Cuboid(double high,double length,double width):Base(high)
	{
		l=length;w=width;
	}
	double disp()
	{
		return h*l*w;
	}
};
class Cylinder:public Base{
protected:
	double r;
public:
	Cylinder(double high,double r1):Base(high)
	{
		r=r1;
	}
	double disp()
	{
		return pi*r*r*h;
	}
};
int main()
{
	Base *p;
	Cuboid Cu(4.2,4.5,5.7);
	Cylinder Cy(5.0,2.0);
	p=&Cu;
	cout<<"长方体的体积为:"<<p->disp()<<endl;
	p=&Cy;
	cout<<"圆柱体的体积为:"<<p->disp()<<endl;
	system("pause");
	return 0;
}