1 #include <iostream>
 2 #include <exception>
 3 using namespace std;
 4 
 5 //继承自带的异常
 6 class sizeerror :public exception
 7 {
 8 public:
 9     sizeerror() :exception("尺寸大小异常")
10     {
11 
12     }
13 
14     const char *what()
15     {
16         char *p = "尺寸大小异常";
17         cout << "尺寸大小异常" << endl;
18         return p;
19     }
20 };
21 
22 class print3d
23 {
24 public:
25     print3d(double size)
26     {
27         if (size > 100)
28         {
29             throw &sizeerror();
30         }
31     }
32 };
33 void main()
34 {
35     try
36     {
37         print3d p(300);
38     }
39     catch (sizeerror *p)
40     {
41         p->what();
42     }
43     cin.get();
44 }