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From: "Jeffrey R. Carter" <spam.jrcarter.not@spam.not.acm.org>
Newsgroups: comp.lang.ada
Subject: Re: getting same output as gfortran, long_float
Date: Thu, 30 Apr 2015 15:12:56 -0700
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Date: 2015-04-30T15:12:56-07:00
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On 04/30/2015 02:17 PM, Nasser M. Abbasi wrote:
> 
> with ada.text_io; use ada.text_io;
> procedure foo_2 is
>   x : Long_Long_Float;
> begin
>   x := 12.0 * 0.0001/(1.0 * (1.0 - 0.1)**4 );
>   put_line(Long_Long_Float'image(x));
> end foo_2;

What do you get with this:

With Ada.Text_IO;
procedure Foo_However_Many is
   X : constant := 12.0 * 0.0001 / (1.0 * (1.0 - 0.1) ** 4);
begin -- Foo_However_Many
   Ada.Text_IO.Put_Line (Item => X'Img);
end Foo_However_Many;

? You probably can't get any more significant digits from GNAT than this gives
you. You could also try a type defined as

type Big is digits System.Max_Digits;

-- 
Jeff Carter
"Many times we're given rhymes that are quite unsingable."
Monty Python and the Holy Grail
57