//  class_simple_string.h  (c) Kari Laitinen

//  http://www.naturalprogramming.com/

//  1998-??-?? File created.
//  2013-11-13 Last modification.

/*  Keyword const has been added to function operator= parameter
    as well as to a constructor parameter.
*/

#ifndef  CLASS_SIMPLE_STRING_H   // prohibiting multiple inclusions
#define  CLASS_SIMPLE_STRING_H

class  Simple_string
{
protected:
   char  characters_of_this_string[ 100 ] ;
   int   number_of_characters_in_this_string ;

public:
   Simple_string() ;
   Simple_string( char given_traditional_string[] ) ;
   Simple_string( const Simple_string&  given_simple_string ) ;

   Simple_string   operator+ ( Simple_string& string_to_append ) ;
   Simple_string&  operator= ( const Simple_string& string_to_copy ) ;

   char&  operator[] ( int  string_index ) ;

   friend  ostream& operator<< ( ostream&        output_stream,
                                 Simple_string&  string_to_output ) ;
} ;

Simple_string::Simple_string()
{
   number_of_characters_in_this_string  =  0 ;
}

Simple_string::Simple_string( char  given_traditional_string[] )
{
   int character_index  =  0 ;

   while ( given_traditional_string[ character_index ]  !=  0 )
   {
      characters_of_this_string[ character_index ]  =
                 given_traditional_string[ character_index ] ;

      character_index  ++ ;
   }

   number_of_characters_in_this_string  =  character_index ;
}

Simple_string::Simple_string( const Simple_string& given_simple_string )
{
   number_of_characters_in_this_string  =
       given_simple_string.number_of_characters_in_this_string ;

   for ( int character_index  =  0 ;
             character_index  <  number_of_characters_in_this_string ;
             character_index  ++ ) 
   {
      characters_of_this_string[ character_index ]  =
       given_simple_string.characters_of_this_string[ character_index ] ;
   }
}


Simple_string
Simple_string::operator+ ( Simple_string&  string_to_append )
{
   Simple_string  sum_of_strings( *this ) ;

   //  sum_of_strings  is  now a copy of "this" string.
   //  All we have to do is to copy the characters of
   //  string_to_append to the end of sum_of_strings.

   int character_index  =  0 ;

   while ( character_index  <  
                string_to_append.number_of_characters_in_this_string )
   {
      sum_of_strings.characters_of_this_string[
          sum_of_strings.number_of_characters_in_this_string +
          character_index ] =
        string_to_append.characters_of_this_string[ character_index ] ;

      character_index  ++  ;
   }

   sum_of_strings.number_of_characters_in_this_string  =
         sum_of_strings.number_of_characters_in_this_string +
         string_to_append.number_of_characters_in_this_string ;

   return  sum_of_strings ;
}


Simple_string&
Simple_string::operator= ( const Simple_string&  string_to_copy )
{
   if ( this  !=  &string_to_copy )
   {
      number_of_characters_in_this_string  =
              string_to_copy.number_of_characters_in_this_string ;

      for ( int character_index  =  0 ;
                character_index  <  number_of_characters_in_this_string ;
                character_index  ++ ) 
      {
         characters_of_this_string[ character_index ]  =
           string_to_copy.characters_of_this_string[ character_index ] ;
      }
   }

   return  *this  ;
}


ostream& operator<< ( ostream&        output_stream,
                      Simple_string&  string_to_output )
{
   int character_index  =  0 ;

   while ( character_index  <  string_to_output.
                                number_of_characters_in_this_string )
   {
      output_stream  <<  
        string_to_output.characters_of_this_string[ character_index ] ;

      character_index   ++  ;
   }         

   return  output_stream ;
}


#endif  // end of include guard