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From: Ludovic Brenta <ludovic@ludovic-brenta.org>
Newsgroups: comp.lang.ada
Subject: Re: Converting Type Characters to type string
Date: Mon, 31 Mar 2008 01:54:24 -0700 (PDT)
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Date: 2008-03-31T01:54:24-07:00
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As a matter of general principle, I always use a for loop when
traversing an array:

procedure Get_Digits (Result : out String; Last : out Natural);
-- Reads at most Result'Length characters from standard input. Stops
-- after the first character that is not a decimal digit.
-- On output, Result (Result'First .. Last) contains the digits from
stdin;
-- Last may be zero, indicating no digits entered (i.e. one character
that
-- is not a digit was read).

procedure Get_Digits (Result : out String; Last : out Natural) is
begin
   Last := Result'Last; -- be optimistic
   for Index in Result'Range loop
      Ada.Text_IO.Get (Result (Index));
      if not Ada.Characters.Handling.Is_Digit (Result (Index)) then
         Last := Index - 1;
         exit;
      end if;
   end loop;
end Get_Digits;

procedure Test_Get is
   Str : String (1 .. 10);
   Last : Natural;
begin
   Get_Digits (Result => Str, Last => Last);
   Ada.Text_IO.Put_Line (Str (1 .. Last));
end Test_Get;

--
Ludovic Brenta.