2023.5.24

 1 #include <iostream>
 2 #include<iomanip>
 3 using namespace std;
 4 class Horse
 5 {
 6 public:
 7     Horse()
 8     {
 9         cout << "Horse 申请了空间..." << endl;
10     }
11     virtual ~Horse()
12     {
13         cout << "Horse 释放了空间..." << endl;
14     }
15     virtual void Fly()
16     {
17         cout << "Just a horse." << endl;
18     }
19 };
20 class Pegasus :public Horse
21 {
22 public:
23     Pegasus()
24     {
25         cout << "Pegasus 申请了空间..." << endl;
26     }
27     ~Pegasus()
28     {
29         cout << "Pegasus 释放了空间..." << endl;
30     }
31     void Fly()
32     {
33         cout << "I can fly!" << endl;
34     }
35 };
36 int main()
37 {
38     Horse* p1 = new Horse; //输出：Horse 申请了空间...
39     Horse* p2 = new Pegasus; /*  输出两行：
40                                  Horse 申请了空间...
41                                  Pegasus 申请了空间...*/
42     cout << endl;
43 
44     p1->Fly(); //输出：Just a horse.
45     p2->Fly(); //输出：I can fly!
46     cout << endl;
47 
48     delete p1; //输出：Horse 释放了空间...
49     delete p2;  /* 输出两行：
50                    Pegasus 释放了空间...
51                    Horse 释放了空间...*/
52     return 0;
53 }