06.cpp

教学目的： 要求理解继承的本质含义以及在面向对象技术中的重要性

#include<iostream.h>          

class Base
{
public:
	virtual void fn()
	{
		cout<<"In Base class\n";
	}
};
class Subclass:public Base
{
public:
	virtual void fn()
	{
		cout<<"In Subclass\n";
	}
};
void test(Base& b)
{
	b.fn();
}
void main()
{
	Base bc;
	Subclass sc;
	cout<<"Calling test(bc)\n";
	test(bc);
	cout<<"Calling test(sc)\n";
	test(sc);
}