//  Uplow.kt  Copyright (c) Kari Laitinen

//  http://www.naturalprogramming.com

//  2020-10-31  File created.

/*  Kotlin documentation says that bitwise and operator works
    only with types int and long.
*/

fun convert_string_uppercase( given_string : String ) : String
{
   var modified_string = StringBuilder( given_string )

   var character_index = 0

   while ( character_index  <  given_string.length )
   {
      if ( given_string[ character_index ]  >=  'a'  &&
           given_string[ character_index ]  <=  'z'  )
      {
         val character_as_integer : Int =
              given_string[ character_index ].toInt() and 0x000000DF 
      
         modified_string[ character_index ] = character_as_integer.toChar()     
      }

      character_index  ++ 
   }

   return  modified_string.toString()
}


fun main()
{
   val test_string  =  "Kotlin is named after an island near St. Petersburg."

   print( "\n Original string:   " + test_string )

   val uppercase_string  =  convert_string_uppercase( test_string )

   print( "\n After conversion:  " + uppercase_string )

   print( "\n Better conversion: " + test_string.toUpperCase() + "\n\n" )

}