Calling a function using NULL object

#include <iostream.h>

#include <conio.h>

  class base 

    {

     int a ;

     public:

     

       void displaySomething()

       {

       cout<< "displaySomething"<<endl ;                   

       } 

  

      void displayMember()

      {

       cout<< a;    

       }

                

      };

  main()

  {

   base * obj = NULL ;

   obj->displaySomething();

   obj->displayMember();

     getch();

     }

Check out the above simple pgm , before running it  .. just think , where the app will crash??

 1. will it crash in obj->displaySomething(); 

 2. obj->displayMember();

 3.  cout<< a;  

run the program 

Are you surprised !!!    

here lesson is , to call the function , we don't need concrete object  (btw , this functions are stored in code segment) .

when we are trying to call "a" which is not available in memory , then app leads to crash   

(Note :  In 3rd party or Native application , we are writing logs at the  beginning and end of the function       for debug purposes . there may be some cases, we will get crash logs , showing only beginning of the function . At this point we are start focusing on the function but null object could be the reason crashing )

However it is a good pgm to know about the data and code segment .