From: Christoph Grein <christoph.grein@eurocopter.com>
Subject: Re: ToString?
Date: Thu, 14 Mar 2002 07:05:05 +0100 (MET)
Date: 2002-03-14T07:05:05+01:00 [thread overview]
Message-ID: <mailman.1016086022.17612.comp.lang.ada@ada.eu.org> (raw)
From: Jeffrey Carter <jeffrey.carter@boeing.com>
> > Ah, the '0' isn't a positive number thang!
>
> It's easy enough to test:
>
> with Ada.Text_IO;
> use Ada.Text_IO
> procedure Is_Zero_Positive is
> Zero : constant := 0;
> begin -- Is_Zero_Positive
> if Zero in Positive then
> Put_Line ("Zero is Positive");
> else
> Put_Line ("Zero is not Positive");
> end if;
> end Is_Zero_Positive;
>
> This puts "Zero is not Positive" to the standard output. QED.
You mean a test or a mathematical proof? For a test, this is OK.
For a proof, you have to prove first that Positive holds only
positive numbers :-)
Perhaps you also have to prove that the symbol 0 you use up there is really a
representation of what you have in mind when speaking about the mathematical
object called 0 :-)
next reply other threads:[~2002-03-14 6:05 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-14 6:05 Christoph Grein [this message]
2002-03-14 16:18 ` ToString? Jeffrey Carter
2002-03-15 14:18 ` ToString? Ted Dennison
-- strict thread matches above, loose matches on Subject: below --
2002-03-12 13:16 ToString? Nazgul
2002-03-12 13:24 ` ToString? Peter Hermann
2002-03-12 13:25 ` ToString? Ingo Marks
2002-03-12 13:27 ` ToString? Larry Hazel
2002-03-12 13:30 ` ToString? Martin Dowie
2002-03-12 16:48 ` ToString? Jeffrey Carter
2002-03-13 8:38 ` ToString? Martin Dowie
2002-03-13 22:18 ` ToString? Jeffrey Carter
2002-03-14 0:36 ` ToString? Adrian Knoth
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