Path: utzoo!attcan!uunet!lll-winken!ames!killer!texbell!bellcore!faline!thumper!ulysses!andante!alice!ark
From: ark@alice.UUCP (Andrew Koenig)
Newsgroups: comp.lang.c
Subject: Re: Comma Operator
Keywords: order of evaluation, comma operator, function call
Message-ID: <8759@alice.UUCP>
Date: 14 Jan 89 19:55:25 GMT
References: <922@quintus.UUCP>
Organization: AT&T Bell Laboratories, Liberty Corner NJ
Lines: 31

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

Whatever the compiler wants to print.

> Shouldn't it be equivalent to:
> 
> 	int a, x, y;
> 	a = (x = 1, y = 2);
> 	printf("%d %d %d\n", a, x, y);

No.

The arguments of printf are not required to be evaluated
in any particular sequence.

> Is there God? Why am I here? :-) :-)

The first question is too difficult for comp.lang.c
The second can be divided into two parts.

Part 1: `Why?'  This is an extremely difficult question as well,
so it is left as an exercise for the reader.

Part 2: `Am I here?'  Answer: yes.
-- 
				--Andrew Koenig
				  ark@europa.att.com