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From: john@viper.UUCP
Newsgroups: comp.lang.c
Subject: order of evaluation
Message-ID: <616@viper.UUCP>
Date: Wed, 4-Mar-87 00:00:57 EST
Article-I.D.: viper.616
Posted: Wed Mar  4 00:00:57 1987
Date-Received: Fri, 6-Mar-87 06:44:17 EST
Reply-To: john@viper.UUCP (John Stanley)
Organization: DynaSoft Systems
Lines: 22


  I made an incorrect statement a few days ago in this newsgroup about the 
order of evaluation of a series of additions where parens were included.
The message I was disagreeing with stated that the parens have no effect
on the structure of the evaluation tree generated.

  Since then, I've received a few messages pointing out references in K&R
which explicitly state that the elements in a series of additions (or
multiplications) may freely be reordered to occur in any order by the
compiler.

  I sit corrected, but I still feel that the standard should have rules
which will allow a programmer to -know- the exact order of evaluation for
any equation.  I know this is not likely for the sole reason that there
are too many different compilers already existing that do the ordering in
far too many different ways....  I still feel that this is a significant
failing in the language definition and would like to see a change.

--- 
John Stanley (john@viper.UUCP)
Software Consultant - DynaSoft Systems
UUCP: ...{amdahl,ihnp4,rutgers}!{meccts,dayton}!viper!john