Path: utzoo!utgpu!water!watmath!clyde!rutgers!cmcl2!husc6!mit-eddie!uw-beaver!uw-june!pardo
From: pardo@june.cs.washington.edu (David Keppel)
Newsgroups: comp.lang.c
Subject: C sintax
Message-ID: <4080@june.cs.washington.edu>
Date: 26 Jan 88 01:36:17 GMT
References: <7072@brl-smoke.ARPA> <7160@brl-smoke.ARPA> <3932@hoptoad.uucp> <4079@june.cs.washington.edu>
Reply-To: pardo@uw-june.UUCP (David Keppel)
Organization: U of Washington, Computer Science, Seattle
Lines: 27

( This isn't related to anything, but I've been unable to figure )
( out a mail path to the guy who asked, and I wanted to answer   )

>> 	;-D on  (My favorite sintax: switch(x+=*a+++*b){...})  Pardo
>
>Boy, you've got that. That's a sin, or should be.
>What, precisely, does x+=*a+++*b mean?

Well, actually it is ambiguous.  There are 2 (or more?) ways to parse
it.  I'm not sure the behavior is defined from lexer to lexer as to
which one is preferred.  Here are some possible interpretations:

    tmp = *a + ++*b;	/* means increment *b and add that to *a */
    x += tmp;
    switch (x) {...}

the (an) other is

    tmp = *a++ + *b;	/* means add *a to *b and increment a */
    x += tmp;
    switch (x) {...}

Not, of course that this is the most obfuscated code possible, but
it does get the point across.


		    ;-D on  (What point?)  Pardo