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Re: strange arithmetic

X-seq: zsh-users 1160
From: Andrew Main <zefram@xxxxxxxxx>
To: mito@xxxxxxxxxxx
Subject: Re: strange arithmetic
Date: Fri, 28 Nov 1997 19:37:05 +0000 (GMT)
Cc: zsh-users@xxxxxxxxxxxxxxx
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

References:
- strange arithmetic
  - From: Louis-David Mitterrand

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