#include <iostream>

 #include <exception>

 using namespace std;

 //继承自带的异常

 class sizeerror :public exception

 {

 public:

     sizeerror() :exception("尺寸大小异常")

     {

     }

     const char *what()

     {

         char *p = "尺寸大小异常";

         cout << "尺寸大小异常" << endl;

         return p;

     }

 };

 class print3d

 {

 public:

     print3d(double size)

     {

         if (size > )

         {

             throw &sizeerror();

         }

     }

 };

 void main()

 {

     try

     {

         print3d p();

     }

     catch (sizeerror *p)

     {

         p->what();

     }

     cin.get();

 }