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Date: Tue, 03 Jul 2012 18:45:35 +0200
From: Georg Bauhaus <rm.dash-bauhaus@futureapps.de>
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Subject: Re: about the new Ada 2012 pre/post conditions
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Date: 2012-07-03T18:45:36+02:00
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On 03.07.12 18:12, Georg Bauhaus wrote:
> this is not decidable,

Two rather mundane illustrations of what "not decidable" might
mean, in the end:

1. Given source text, you are supposed to predict what
happens. Choices given are: compilation fails; no output;
output X; output Y. Now suppose compilation must fail. Is it
correct, then, to say that "no output" is what happens, too?

2. In a TV show, the hosts ask candidates questions such
as this: name all countries in the same time zone as
ours, X. One candidate says X. His choice is rejected.