7_4.cpp

来自「湖南大学ACM-OJ的部分题目代码」· C++ 代码 · 共 36 行

#include<iostream>
using namespace std;
class B0
{
public:
	void display(){cout<<"B0::display"<<endl;}
};
class B1:public B0
{
public:
	void dispaly(){cout<<"B1::display()"<<endl;}
};
class D1:public B1
{
public:
	void dispaly(){cout<<"D1::display()"<<endl;}
};
void fun(B0 *ptr)
{
	ptr->display();
}
void main()
{
	B0 b0;
	B1 b1;
	D1 d1;
	B0 *p;
	p=&b0;
	fun(p);
	p=&b1;
	fun(p);
	p=&d1;
	fun(p);
}