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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Interfacing Ada with C
Newsgroups: comp.lang.ada
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Date: Fri, 6 Aug 2010 10:42:26 +0200
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Date: 2010-08-06T10:42:27+02:00
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On Fri, 06 Aug 2010 10:04:24 +0200, Jacob Sparre Andersen wrote:

> Ada novice <posts@gmx.us> wrote:
> 
>> Can we change the subtype to Long_Long_Float? This will be of 18
>> precision digits [...]
> 
> That's not guaranteed.  If you want 18 digits, you should declare the
> type (My_Float?) as:
> 
>    type My_Float is digits 18;

Further, practically you should never use subtype in the form

   subtype My_Float is Long_Float;

except for special cases like:

   subtype Non_IEEE_Float is Long_Float range Long_Float'Range;

or

   subtype Non_Negative_Float is Long_Float range 0.0..Long_Float'Last;

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de