c++实验5

 1 #include <iostream>
 2 #include <string>
 3 using namespace std;
 4 
 5 class machinepets{
 6     public:
 7         machinepets(string s):nickname(s){}
 8         virtual string talk()=0;
 9         string getnickname(){
10             return nickname;
11         }
12     private:
13         string nickname;
14     
15 };
16 
17 class petdogs:public machinepets{
18     public:
19         petdogs(string s):machinepets(s){}
20         string talk(){
21                 
22             return machinepets::getnickname().append(" says wang wang~");//子类调用父类的成员函数可以使用（父类名：：父类成员函数） 
23         }
24     private:
25         
26 };
27 
28 class petcats:public machinepets{
29     public:
30         petcats(string s):machinepets(s){    }
31         string talk(){
32 
33             return machinepets::getnickname().append(" says miao wu~");
34         }
35     private:
36         
37 };
38 
39 
40 void play(machinepets *p) 
41 { cout << p->talk() << endl; }
42 
43 int main() 
44 {  petcats cat("miku");    
45    petdogs dog("da huang");
46    play(&cat);    
47    play(&dog);
48    return 0; 
49 }