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Newsgroups: comp.lang.ada
Date: Tue, 6 May 2014 06:31:13 -0700 (PDT)
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Subject: Re: Noob question..  Autopromotion?
From: gautier_niouzes@hotmail.com
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Xref: number.nntp.dca.giganews.com comp.lang.ada:186267
Date: 2014-05-06T06:31:13-07:00
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Hello,
As Adam said, a figure read as a literal in the Ada source code and a figure read from a string from an user are different topics. Typically figures with or without .0 are valid (to GNAT and OA run-time libraries at least).

   with ada.text_io;
   procedure value is
   begin
     ada.text_io.put_line(float'image(float'Value("1234.0")));
     ada.text_io.put_line(float'image(float'Value("1234")));
   end;

Now, you may have user inputs with thousands separators and/or percents, for instance - especially if the input is actually a slight modification of an output). So you will certainly need a custom solution anyway.
Here is a function dealing with both (filtering thousands separators, and doing *0.01 with percent signs):

  function Value(s: String) return Real is
    t: constant String:= Trim(s, Both);
    ft: String(t'Range);
    j: Integer;
  begin
    if t'Length > 0 and then t(t'Last) = '%' then
      return Value(t(t'First .. t'Last-1)) * 0.01;
    elsif Index(t, (1 => thousands_separator)) = 0 then
      return Real'Value(t);
    else -- filter all thousands separators...
      j:= ft'First - 1;
      for i in t'Range loop
        if t(i) /= thousands_separator then
          j:= j + 1;
          ft(j):= t(i);
        end if;
      end loop;
      return Value(ft(ft'First .. j));
    end if;
  end Value;
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