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From: Ludovic Brenta <ludovic@ludovic-brenta.org>
Newsgroups: comp.lang.ada
Subject: Re: AW: Translating an embedded C algorithm
References: <mailman.27.1169017665.18371.comp.lang.ada@ada-france.org>
	<878xg2aqzr.fsf@ludovic-brenta.org>
	<uhmz4hy55q.fsf@hod.lan.m-e-leypold.de>
Date: Thu, 18 Jan 2007 09:49:48 +0100
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Date: 2007-01-18T09:49:48+01:00
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Markus E Leypold writes:
> Ludovic Brenta <ludovic@ludovic-brenta.org> writes:
>> Right, and there would be no need for a silly INVALID_TEMPERATURE.
>> What *is* an invalid temperature anyway?  One that needs crutches?
>> One that is excused from military service? And why would you ever
>> return an invalid temperature to your caller? etc. etc.
>
> | >> --| Temperature in ºC x 10. INVALID_TEMPERATURE if out of range.
>
> If the sensor is out of order or the temperature leaves the range
> where it functions properly?
>
> :-). 

My point it this: if the sensor is out of order, then there is no
known temperature; not a known "invalid" temperature.  The proper way
to handle that in Ada is with an exception, not a special value of
type Degrees_C.

-- 
Ludovic Brenta.