13_1.cpp

vc++的实验和实训例子非常适合初学者学习和阅读

#include<iostream.h>
class container
{
protected:
	double radius;
public:
	container(double radius)
	{
		container::radius=radius;
	}
	virtual double surface_area()=0;
	virtual double volume()=0;
};
class cube:public container
{
public:
	cube(double radius):container(radius){};
	double surface_area()
	{
		return radius*radius*6;
	}
	double volume()
	{
		return radius*radius*radius;
	}
};
class sphere:public container
{
public:
	sphere(double radius):container(radius){};
	double surface_area()
	{
		return 4*3.1416*radius*radius;
	}
	double volume()
	{
		return 3.1416*radius*radius*radius*4/3;
	}
};
class cylinder:public container
{
	double height;
public:
	cylinder(double radius,double height):container(radius)
	{
		cylinder::height=height;
	}
	double surface_area()
	{
		return 2*3.1416*radius*(height+radius);
	}
	double volume()
	{
		return 3.1416*radius*radius*height;
	}
};
void main()
{
	container *p;
	cube obj1(10);
	sphere obj2(6);
	cylinder obj3(4,5);
	p=&obj1;
	cout<<"输出结果："<<endl;
	cout<<"正方体表面积："<<p->surface_area()<<endl;
	cout<<"正方体体积："<<p->volume()<<endl;
	p=&obj2;
	cout<<"球体表面积："<<p->surface_area()<<endl;
	cout<<"球体体积："<<p->volume()<<endl;p=&obj1;
	p=&obj3;
	cout<<"圆柱体表面积："<<p->surface_area()<<endl;
	cout<<"圆柱体体积："<<p->volume()<<endl;
}