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From: "robin" <robin51@dodo.com.au>
Newsgroups: comp.lang.ada
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Subject: Re: How would Ariane 5 have behaved if overflow checking were
 notturned off?
Date: Thu, 17 Mar 2011 22:48:22 +1100
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Date: 2011-03-17T22:48:22+11:00
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Simon Wright wrote in message ...
>"robin" <robin51@dodo.com.au> writes:
>
>> An error handler would have rescued the mission.
>
>Errm - if the fixed-point type used for horizontal velocity was say
>
>   delta 2.0**-14 range -2.0 .. 2.0
>
>the compiler would almost certainly have packed it so that there were no
>spare bits; 1.9999 would be represented as 16#3fff#.

The value, presumably, in an integer word is, well, an integer.

> So if the value
>that is to be fitted into this type is >= 2.0, there is no way to
>represent it and any calculations based on the velocity over the ground
>as stored would be garbage.

Plenty of scope to substitute a signed value of max. magnitude.