08.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(int x)
	{
		cout<<"In Base class,int x="<<x<<endl;
	}
};
class Subclass:public Base
{
public:
	virtual void fn(float x)
	{
		cout<<"In Subclass,float x="<<x<<endl;
	}
};
void test(Base& b)
{
	int i=1;
	b.fn(i);
	float f=2.0;
	b.fn(f);
}
void main()
{
	Base bc;
	Subclass sc;
	cout<<"Calling test(bc)\n";
	test(bc);
	cout<<"Calling test(sc)\n";
	test(sc);
}