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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: float with 24-bit resolution
Date: 15 Aug 2003 20:56:30 +0100
Organization: Pushface
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"Jeffrey Creem" <jeff@thecreems.com> writes:

> package My_Pack is
> 
> The_Delta : constant := 4.291534424e-5;
>   type Probably_Gonna_Work_But_Language_Lawyers_Will_Complain_Type is delta
> The_Delta range - 360.0 .. 359.9999571;

You need to use the compiler's inbuilt infinite precision arithmetic here:

package Angles is

   Angle_Delta : constant := 360.0 / 2 ** 23;

   type Angle is delta Angle_Delta range -360.0 .. 360.0 - Angle_Delta;
   for Angle'Small use Angle_Delta;
   for Angle'Size use 24;
   
end Angles;

(this compiles, at least!)