Path: utzoo!attcan!uunet!husc6!cmcl2!lanl!jlg
From: jlg@lanl.gov (Jim Giles)
Newsgroups: comp.lang.fortran
Subject: Re: i++, i+=1, i=i+1
Message-ID: <3701@lanl.gov>
Date: 16 Sep 88 21:06:46 GMT
References: <3979@h.cc.purdue.edu>
Organization: Los Alamos National Laboratory
Lines: 23

From article <3979@h.cc.purdue.edu>, by ags@h.cc.purdue.edu (Dave Seaman):
> May I suggest that you read the standard before making such statements?
> At least one variety of side effect is explicitly permitted by the
> standard.  I quote the last paragraph of Section 15.5.1, "Function
> Subprogram and FUNCTION Statement":
> 
> 	An external function in a function subprogram may define one or
> 	more of its dummy arguments to return values in addition to the
> 	value of the function.
 

May I suggest that you read the standard before making such statements?
I had forgotten the above (that is, in fact, the only side effect
allowed explicitly).  But you seem to have forgotten the last paragraph
of Section 6.6.2, "Order of Evaluation of Functions":

      In a statement that contains more than one function
      reference, the value provided by each function reference
      must be independent of the order chosen by the processor for
      evaluation of the function references.

J. Giles
Los Alamos