Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!pt.cs.cmu.edu!andrew.cmu.edu!tg1e+
From: tg1e+@andrew.cmu.edu (Timothy R. Gottschalk)
Newsgroups: comp.lang.c
Subject: swap(x,y)
Message-ID: <MYwDEFy00WB842JEUx@andrew.cmu.edu>
Date: 22 Aug 89 06:34:57 GMT
Organization: Carnegie Mellon, Pittsburgh, PA
Lines: 14


       To swap two variables x,y in C without using a temporary variable:

       /* begin swap */
       x += y;
       y = x - y;
       x -= y;
       /* end swap */

       Just curious...(this looks pretty valid) does anyone know an even
simpler method?  I would never program this way -- it's more of a theory
question.  I've been told that it can't be done (???).
Tim Gottschalk
Pgh, PA