Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ulowell!masscomp!ftw
From: ftw@masscomp.UUCP (Farrell Woods)
Newsgroups: comp.lang.c
Subject: Re: printf() problem
Keywords: C printf
Message-ID: <759@masscomp.UUCP>
Date: 28 Apr 89 14:11:04 GMT
References: <11657@hodge.UUCP> <353@secola.Columbia.NCR.COM>
Reply-To: ftw@quasar.masscomp.UUCP (Farrell Woods)
Organization: Concurrent Computer Corporation - Westford, Ma
Lines: 21

In article <353@secola.Columbia.NCR.COM> gharris@secola.Columbia.NCR.COM (Buddy Harris) writes:

>This is something that I don't understand either, but apparently 
>printf() evluates from right to left.  Be careful with stetements like this:

>     printf("%d %d %d %d", i++, i++, i++, i++);

>This evluates from right to left also.  

DO NOT depend on this being true in all cases!  The compiler is free to
evaluate arguments in whatever order it sees fit.  Your compiler may evaluate
the arguments in that printf call from right to left, but another may
quite reasonably evaluate them left to right.  If the expressions have side
effects, and you're depending on the order in which those side effects happen,
you have non-portable code.

-- 
Farrell T. Woods				Voice:  (508) 392-2471
Concurrent Computer Corporation			Domain: ftw@masscomp.com
1 Technology Way				uucp:   {backbones}!masscomp!ftw
Westford, MA 01886				OS/2:   Half an operating system