110.纯虚函数

 1 #include <iostream>
 2 using namespace std;
 3 
 4 class myclass
 5 {
 6 public:
 7     virtual void go()
 8     {
 9         cout << "123" << endl;
10     }
11 
12     //纯虚函数,有纯虚函数的类不能创建对象
13     virtual void run() = 0;
14 };
15 
16 class live
17 {
18 public:
19     //纯虚函数作为接口
20     //一旦继承了,必须实现虚函数的接口
21     virtual void life() = 0;
22     virtual void sleep() = 0;
23 };
24 
25 class people :public live
26 {
27 public:
28     virtual void think() = 0;
29 };
30 
31 class birdpeople :public people
32 {
33 public:
34     virtual void fly()
35     {
36         cout << "i can fly" << endl;
37     }
38     void life()
39     {
40         cout << "i can live every time" << endl;
41     }
42     void sleep()
43     {
44         cout << "i can sleep" << endl;
45     }
46     void think()
47     {
48         cout << " i can think" << endl;
49     }
50 };
51 
52 void main()
53 {
54     //myclass *p = new myclass;
55     //p->go();
56     birdpeople aa;
57     cin.get();
58 }