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From: KK6GM <mjsilva@scriptoriumdesigns.com>
Newsgroups: comp.lang.ada
Subject: Re: How would Ariane 5 have behaved if overflow checking were not
 turned off?
Date: Mon, 14 Mar 2011 13:28:17 -0700 (PDT)
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Date: 2011-03-14T13:28:17-07:00
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On Mar 14, 12:25=A0pm, Yannick Duch=EAne (Hibou57)
<yannick_duch...@yahoo.fr> wrote:
> Le Mon, 14 Mar 2011 17:17:10 +0100, KK6GM <mjsi...@scriptoriumdesigns.com=
> =A0
> a =E9crit:> It really all comes back to the essential question, if variab=
le X is
> > known, PROVEN, to never exceed the range A..B, and suddenly it does
> > exceed that range, what is the correct action? =A0You can't just throw
> > it away and read it again, since in the Ariane 5 case it would have
> > continued to exceed its proven valid range. =A0So what do you do?
>
> Seems the proof was rather weak there ;)

Well, if I "prove" that the length of an earth day can never be more
than 25 hours, and that if some sensor measures more than 25 hours I
must have a hardware failure, and then I run my system on venus and
the measured day is truly more than 25 hours, what should happen?