/*  Stringing.c  (c) Kari Laitinen

    http://www.naturalprogramming.com/

    2013-11-24 File created.
    2013-11-24 Last modification.
*/

#include <stdio.h>
#include <string.h>

int main()
{
   char abcdefgh_string[] = "abcdefgh" ;
   char xxxxxxxx_string[] = "xxxxxxxx" ;

   char defgzzzz_string[ 80 ] ;

   strncpy( defgzzzz_string, &abcdefgh_string[ 3 ], 4 ) ;
   defgzzzz_string[ 4 ] = 0 ; // Terminating the string.

   strcat( defgzzzz_string, "zzzz" ) ;

   // Now defgzzzz_string points to "defgzzzz"

   char text_to_print[ 120 ] ;

   strcpy( text_to_print, "  " ) ;
   strcat( text_to_print, abcdefgh_string ) ;
   strcat( text_to_print, "  " ) ;
   strcat( text_to_print, xxxxxxxx_string ) ;
   strcat( text_to_print, "  " ) ;
   strcat( text_to_print, defgzzzz_string ) ;
   strcat( text_to_print, "  " ) ;

   printf( "\n" ) ;

   int character_index ;

   for ( character_index  =  0  ;
         character_index  <  strlen( text_to_print ) ;
         character_index  ++ )
   {
      printf( "%c", text_to_print[ character_index ] ) ;
   }

   printf( "\n\n" ) ;

   // Next, we'll use a pointer to print the string pointed by
   // text_to_print. The string will be printed first in normal
   // order and then in reverse order.

   char* character_in_text ;  // Here we declare a pointer

   // The pointer will be made to point to the first character
   // of the string. An array name such as text_to_print refers
   // to the beginning of the array
   character_in_text  =  text_to_print ;

   while ( *character_in_text  !=  0 )
   {
      printf( " %c", *character_in_text ) ;

      character_in_text  ++  ;
   }

   printf( "\n" ) ;

   // Next we'll make the pointer point to the null (zero) that
   // terminates the string to be printed.
   character_in_text  =  text_to_print + strlen( text_to_print ) ;

   while ( character_in_text  >  text_to_print )
   {
      character_in_text  --  ;

      printf( " %c", *character_in_text ) ;
   }

   printf( "\n" ) ;
}

/* The output of this program is the following.

  abcdefgh  xxxxxxxx  defgzzzz

     a b c d e f g h     x x x x x x x x     d e f g z z z z
     z z z z g f e d     x x x x x x x x     h g f e d c b a

*/