137.CPP自带异常

1 1 #include <iostream>
2 2 #include <exception>
3 3 using namespace std;
4 4 
5 5 //继承自带的异常
6 6 class sizeerror :public exception
7 7 {
8 8 public:
9 9     sizeerror() :exception("尺寸大小异常")
1010     {
1111 
1212     }
1313 
1414     const char *what()
1515     {
1616         char *p = "尺寸大小异常";
1717         cout << "尺寸大小异常" << endl;
1818         return p;
1919     }
2020 };
2121 
2222 class print3d
2323 {
2424 public:
2525     print3d(double size)
2626     {
2727         if (size > 100)
2828         {
2929             throw &sizeerror();
3030         }
3131     }
3232 };
3333 void main()
3434 {
3535     try
3636     {
3737         print3d p(300);
3838     }
3939     catch (sizeerror *p)
4040     {
4141         p->what();
4242     }
4343     cin.get();
4444 }