/*  PointerSimple.c  (c) Kari Laitinen

    http://www.naturalprogramming.com/

    2013-11-25 File created.
    2013-11-25 Last modification.
*/

#include <stdio.h>

int main()
{
   int  first_integer   =  44, second_integer  =  66,
        third_integer   =  88 ;

   int*  pointer_to_integer ;

   printf( "\n Address of first_integer:  %X" 
           "\n Address of second_integer: %X" 
           "\n Address of third_integer:  %X",
           &first_integer, &second_integer, &third_integer ) ;

   printf( "\n\n first   second  third   *pointer    pointer \n" ) ;

   pointer_to_integer   =  &first_integer ;

   printf( "\n   %d     %d       %d       %d       %X",
           first_integer, second_integer, third_integer,
           *pointer_to_integer, pointer_to_integer ) ;

   second_integer         =  *pointer_to_integer ;
   *pointer_to_integer =  333 ;

   printf( "\n   %d    %d       %d      %d       %X",
           first_integer, second_integer, third_integer,
           *pointer_to_integer, pointer_to_integer ) ;

   pointer_to_integer  =  &third_integer ;
   *pointer_to_integer =  999 ;

   printf( "\n   %d    %d      %d      %d       %X\n",
           first_integer, second_integer, third_integer,
           *pointer_to_integer, pointer_to_integer ) ;
}

/*  Here is a sample run of this program:


 Address of first_integer:  22FF74
 Address of second_integer: 22FF70
 Address of third_integer:  22FF6C

 first   second  third   *pointer    pointer

   44     66       88       44       22FF74
   333    44       88      333       22FF74
   333    44      999      999       22FF6C

*/