Path: utzoo!attcan!uunet!lll-winken!lll-ncis!lll-lcc!ames!haven!adm!smoke!gwyn
From: gwyn@smoke.BRL.MIL (Doug Gwyn )
Newsgroups: comp.lang.c
Subject: Re: Comma Operator
Keywords: order of evaluation, comma operator, function call
Message-ID: <9367@smoke.BRL.MIL>
Date: 14 Jan 89 12:33:24 GMT
References: <922@quintus.UUCP>
Reply-To: gwyn@brl.arpa (Doug Gwyn (VLD/VMB) <gwyn>)
Organization: Ballistic Research Lab (BRL), APG, MD.
Lines: 13

In article <922@quintus.UUCP> nair@quintus () writes:
>What should this print?
>	printf("%d %d\n", (x = 1, y = 2), x, y);

"Warning -- missing format specifier for one argument".

>Is there any justification in the first one printing
>	2 1 0

[Assuming the format spec was fixed.]
The order in which arguments to functions are evaluated is intentionally
unspecified.  Some implementations do it one way, some another.  In your
case it appears that they were evaluated right-to-left.