#include<iostream>

 #include<cstdlib>

 using namespace std;

 ////非安全退出，结束进程,

 //C++ 必须释放对象，最后结束，安全退出

 class pstr

 {

     int *p;

 public:

     pstr()

     {

         cout << "构造" << endl;

         p = new int[ * ];

     }

     ~pstr()

     {

         cout << "析构" << endl;

         delete[] p;

     }

 };

 void run3(int i)

 {

     if (i == )

     {

         //throw  1;

         exit();  //非安全退出，结束进程

         //安全退出，释放对象内存，再结束进程

     }

     else

     {

         cout << "run3" << endl;

     }

 }

 void run2(int i)

 {

     pstr p2;

     run3();

 }

 void run1(int i)

 {

     pstr p1;

     run2(i);

 }

 void main()

 {

     try

     {

         run1();

     }

     catch (int i)

     {

         cout << i << "error";

     }

     std::cin.get();

     exit();

 }