继承与虚函数

Posted 2022-01-01 goldenellipsis

 1 #include <string>
 2 #include <iostream>
 3 
 4 class A
 5 public: 
 6     virtual std::string toString()
 7     //std::string toString()
 8         return "A";
 9     
10 ;
11 
12 class B: public A
13 public: 
14     std::string toString()
15         return "B";
16     
17 ;
18 
19 class C: public B
20 
21 public: 
22     std::string toString()
23         return "C";
24     
25 ;
26 
27 void print(A* o)
28     std::cout<<o->toString()<<std::endl;
29 
30 
31 int main() 
32     A a;
33     B b;
34     C c;
35     print(&a);
36     print(&b);
37     print(&c);
38     return 0;
39