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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: about the new Ada 2012 pre/post conditions
Date: Fri, 6 Jul 2012 10:05:28 +0200
Organization: cbb software GmbH
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Date: 2012-07-06T10:05:28+02:00
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On Fri, 06 Jul 2012 09:41:18 +0200, Georg Bauhaus wrote:

> On 05.07.12 21:55, Dmitry A. Kazakov wrote:
>> On Thu, 5 Jul 2012 12:11:57 -0700 (PDT), Adam Beneschan wrote:
>>
>>> On Thursday, July 5, 2012 12:48:30 AM UTC-7, Dmitry A. Kazakov wrote:
>>>
>>>> Putting it even simpler. What is the effect of:
>>>>
>>>>     sqrt (-1.0)
>>>>
>>>> No effect? Any effect?
>>>
>>> This looks like an imaginary problem to me, not a real one.
>>
>> What problem? It was a simple question illustrating absurdity of the idea.
> 
> Actually, a negative argument passed to sqrt is illustrating proper DbC
> well. One famous example is Ariane 4, (4), that's the number four.

If sqrt (-1.0) has no effect, what made Ariane to explode? Exploding is not
an effect, right?

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de