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 }
