C++中基类对象的引用

 1 #include <iostream>
 2 #include <cstdio>
 3 
 4 using namespace std;
 5 
 6 class A{
 7     public:
 8         void print(){
 9         //virtual void print(){
10             cout<<"A"<<endl;
11         }
12 };
13 class B:public A{
14     public:
15         void print(){
16             cout<<"B"<<endl;
17         }
18 };
19 
20 int main(){
21 
22     B b;
23     A& a = b;
24     a.print();
25 
26     return 0;
27 }