一定要使用指针吗?
#include<iostream.h>class Grandam {
public:
virtual void introduce_self() // 定义虚函数introduce_self()
{ cout<<"I am grandam."<<endl; }
};
class Mother:public Grandam {
public:
void introduce_self() // 重新定义虚函数introduce_self()
{ cout<<"I am mother."<<endl;}
};
class Daughter:public Mother {
public:
void introduce_self() // 重新定义虚函数introduce_self()
{ cout<<"I am daughter."<<endl;}
};
void main()
{
Grandam *ptr;
Grandam g;
Mother m;
Daughter d;
ptr=&g;
ptr->introduce_self(); //调用基类Grandam的introduce_self()
ptr=&m;
ptr->introduce_self(); // 调用派生类Mother的introduce_self()
ptr=&d;
ptr->introduce_self(); //调用派生类
// Daughter的introduce_self()
}
