137.CPP自带异常

 #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();
 }