来自「visualCplusplus学习课件大连东软培训教材」· 代码 · 共 46 行

#include "stdafx.h"
#include <iostream.h>
#include <conio.h>
class CBase
{
protected:
	int baseval;
public:
	CBase(int v){baseval=v;}
	CBase(){};
	virtual void Virfun();
};
void CBase::Virfun()
{
	cout<<" This message is from the virtual"<<endl;
	cout	<<" function defined in the Base class."<<endl;
}
class CDer:public CBase
{
protected:
	int derval;
	void Virfun();
public:
	CDer(int v){derval=v;}
	CDer(){}
};
void CDer::Virfun()
{
	cout<<" This message is from the virtual"<<endl;
	cout	<<"function defined in the derived class."<<endl;
}

void UseVirtual(CBase * obj)
{
	obj->Virfun();
}

void main()
{
	CDer* derobj=new CDer;
	//clrscr();
	UseVirtual(derobj);
	getchar();
}