導航

 1 #pragma once
 2 #include<iostream>
 3 #include<string>
 4 using std::string;
 5 using std::cout;
 6 using std::endl;
 7  class MachinePets {
 8  private:
 9        string nickname;
10 public:
11        MachinePets(const string & s = "");
12        string get_nickname() const;
13     virtual string talk() = 0;
14 };
15 MachinePets::MachinePets(const string & s) :nickname{ s } {
16 }
17 string MachinePets::get_nickname() const {
18        return nickname;
19 }
20 class PetCats :public MachinePets {
21  public:
22        PetCats(const string & s = "");
23        string talk();
24 };
25 PetCats::PetCats(const string & s) :MachinePets{ s } {
26 }
27 string PetCats::talk() {
28     return "miao wu~";
29 }
30  class PetDogs :public MachinePets {
31  public:
32         PetDogs(const string & s = "");
33       string talk();
34 };
35 PetDogs::PetDogs(const string & s) :MachinePets{ s } {
36 }
37 string PetDogs::talk() {
38       return "wang wang~";
39 }