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From: Andrew Main <zefram@tao.co.uk>
To: mito@aparima.com
Cc: zsh-users@math.gatech.edu
Subject: Re: strange arithmetic
Date: Fri, 28 Nov 1997 19:37:05 +0000 (GMT)	[thread overview]
Message-ID: <199711281937.TAA12593@taos.demon.co.uk> (raw)
In-Reply-To: <19971128140924.07137@retriever> from "Louis-David Mitterrand" at Nov 28, 97 02:09:24 pm

Louis-David Mitterrand wrote:
>% i=0;while [[ $[++i] < 900 ]];do;echo $i;done

"<" does a string comparison.  For a numeric comparison, you want "-lt".

>% i=0;while ! [[ $[++i] = 900 ]];do;echo $i;done

"=" (or the preferred "==") also does string comparison.  You should
really use "-eq" here.

I've just noticed that this is exactly the opposite convention from Perl.
I can even see why the difference was historically inevitable.

-zefram


  reply	other threads:[~1997-11-28 20:16 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
1997-11-28 19:09 Louis-David Mitterrand
1997-11-28 19:37 ` Andrew Main [this message]
1997-11-28 20:16 ` Alain Caron
1997-11-28 20:30   ` Louis-David Mitterrand
1997-11-29  2:04     ` Dan Nelson
1997-11-29 14:40       ` Louis-David Mitterrand
1997-11-29 11:44 ` Christopher Croughton

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