gistfile1.cpp

#include <iostream>

using namespace std;

class A{
protected:

int i;
public:

A():i(0){ cout << "A" ; }
 A(A& ob){ cout << "B"; }
 ~A(){ cout << "C"; }
 void fun(){ cout << "D"; }
};

class B: public A{

public:
 B(){ cout << "E"; }
 B(B& ob){ cout << "F"; }
 ~B(){ cout << "G"; }
 int get(){ return i; }
};

A* fun(B& ob){
 if ( !ob.get() )
 throw ob;

return &ob;
}

int main(int argc, char* argv[]){
  B ob;
    try{
      fun(ob);
    }
    catch(B& ob){
      cout << "W";
    }
    catch(A& ob){
      cout << "O";
    }
    
  cout << endl;
  return 0;
}