Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!news.glorb.com!postnews.google.com!news1.google.com!Xl.tags.giganews.com!border1.nntp.dca.giganews.com!nntp.giganews.com!local2.nntp.dca.giganews.com!nntp.earthlink.com!news.earthlink.com.POSTED!not-for-mail
NNTP-Posting-Date: Mon, 07 May 2012 04:48:24 -0500
Message-ID: <4FA79A67.5017@mindspring.com>
Date: Mon, 07 May 2012 05:48:23 -0400
From: pete <pfiland@mindspring.com>
Reply-To: pfiland@mindspring.com
Organization: PF
X-Mailer: Mozilla 3.04Gold (WinNT; I)
MIME-Version: 1.0
Newsgroups: comp.lang.c
Subject: Re: Operator precedence.
References: <76630b90-04ab-4976-b1a0-76868d85ccf5@vy9g2000pbc.googlegroups.com>
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Lines: 35
X-Usenet-Provider: http://www.giganews.com
NNTP-Posting-Host: 4.154.216.54
X-Trace: sv3-UyhZOgzegjlU0Z/cmT3C1pJ7tEX3Lu8QOnA4gHEdfS96pOvd6X1SFPqF7ytXldXJ9QZQGHzXf+M/iz6!t+PcqouCF++Z21JrvS4KtR0lApZ7W9oDeE+I/6YfasQjhB1uAZR8LqLrmt6DYF33Gw9L3owc6/Ow!vQmgMUQPAw==
X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers
X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly
X-Postfilter: 1.3.40
X-Original-Bytes: 2361
Xref: csiph.com comp.lang.c:20443

somenath wrote:
> 
> Hi All,
> 
> While browsing through the old article in this group I have come
> across  one article by Chrish Torek.
> http://groups.google.com/group/gnu.gcc.help/browse_thread/thread/31750b84b212325/d97a0f655e96ce16?lnk=gst&q=compiler+munching+%2B++chrish+torek#d97a0f655e96ce16
> 
> In this article he said.
> 
> "Finally, let me say one last time that the Standard C grammar DOES
> NOT use operator precedence.  (At most, one can say that the grammar
> "implies" a precedence.  I believe the word "specifies" is too
> strong, despite its appearance in a non-normative footnote."
> 
> So the  following expression
> 
> 2+3*5;
> is equal to 17.  For  human * has higher precedence than + so *
> operator will be first operated on 3*5 and then the resultant will be
> added to 2. So the result will be 2+(3*5) .
> 
> Then my question is how C compiler with out bothering about precedence
> produce the same result as 2+(3*5).
> 
> I tried to explain myself the outcome of 2+3*5  the way Chris Torek
> has explained the expression   -- - x  but I am not able to construes
> how the precedence of * will be enforced by the C grammar with out
> using operator precedence.

I can't do it either.
I use the precedence table in chapter 2 of K&R instead.

-- 
pete