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From: Martin <martin.dowie@btopenworld.com>
Newsgroups: comp.lang.ada
Subject: Re: About the F-22 software bug
Date: Sat, 6 Feb 2010 01:28:56 -0800 (PST)
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On Feb 5, 4:50=A0pm, Hibou57 (Yannick Duch=EAne)
<yannick_duch...@yahoo.fr> wrote:
> On 5 f=E9v, 11:31, "Dmitry A. Kazakov" <mail...@dmitry-kazakov.de>
> wrote:
>
> > And shift does not solve the problem anyway, if that existed. The poten=
tial
> > problem is that the angle is not a real number. It could be represented=
 by
> > one, but then the operations like +, -, *, /, =3D, /=3D must be replace=
d and
> > ones like <, >, <=3D, >=3D disallowed.
>
> I would have thought for reals, operations like +, -, *, /, <, >, /=3D
> changed and =3D, <=3D, >=3D disallowed
> Is there something I don't understand ?

Longitude is cyclical - < and > only 'work' if there is a hard-stop at
each end.

You can make up some rules that might work for a project, e.g. 2
points are only ever compared using the shortest route between them
(and not the route that goes [almost] round the earth!) but it isn't
really an honest abstraction.

Cheers
-- Martin