1 #include<iostream>
 2 #include<windows.h>
 3 using namespace std;
 4 class T
 5 {
 6 protected:
 7     int t;
 8 public:
 9     T(int r=0):t(r){}
10     void showNum(){cout<<t<<endl;}
11 };
12 class T1:public T
13 {
14 private:
15     int x;
16 public:
17     T1(int r):x(r),T(r){}
18     void show(){cout<<"x="<<x<<endl;}
19 };
20 class T2:public T
21 {
22 private:
23     int x;
24 public:
25     T2(int r):x(r*r),T(r){}
26     void show(){cout<<"x="<<x<<endl;}
27 };
28 void main()
29 {
30     T* p[5];
31     for(int i=0;i<5;i++)
32     {
33         if(i%2==0)
34         {T1 r(2);p[i]=&r;cout<<&r<<endl;}
35         else
36         {T2 r(3);p[i]=&r;cout<<&r<<endl;}
37     }
38     for(int i=5;i<10;i++)
39     {
40         if(i%2==0)
41         {T1 r(4);p[i]=&r;cout<<&r<<endl;}
42         else
43         {T2 r(5);p[i]=&r;cout<<&r<<endl;}
44     }
45     for(int i=0;i<10;i++)
46     {
47         p[i]->showNum();
48     }
49     system("pause");
50 }