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cond?true:false and division by 0

From: dnade.ext
Subject: cond?true:false and division by 0
Date: Mon, 1 Aug 2011 10:41:18 +0200


I wanted to check a variable before attempting to divide something by it, so I 
wrote :

echo $(( foo==0?0:something/foo ))

And bash 2, 3 and up to 4.2.10 version sent me a "division by 0" error.

So, I've tested a static version of the statement :

$ echo $(( 0==0?0:1/0 ))
-bash: 0==0?0:1/0 : division by 0 (error token is " ")

It looks like the "division by 0" happens whatever the condition result.
Shouldn't it happen only if condition result make the computing go that far 
(like, FWIW, in zsh) ?


Damien Nadé <address@hidden>
Astek Sud-Est pour France Télécom - FT/OF/OFA/DMGP/PORTAIL/DOP/DEV/EAQS
Sophia Antipolis - France / Tel : 04 97 12 86 20

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