Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!uflorida!rex!ginosko!uunet!pilchuck!dataio!bright
From: bright@Data-IO.COM (Walter Bright)
Newsgroups: comp.lang.c
Subject: Re: swap(x,y)
Message-ID: <2108@dataio.Data-IO.COM>
Date: 23 Aug 89 20:49:50 GMT
References: <MYwDEFy00WB842JEUx@andrew.cmu.edu>
Reply-To: bright@dataio.Data-IO.COM (Walter Bright)
Organization: Data I/O Corporation; Redmond, WA
Lines: 12

In article <MYwDEFy00WB842JEUx@andrew.cmu.edu> tg1e+@andrew.cmu.edu (Timothy R. Gottschalk) writes:
<To swap two variables x,y in C without using a temporary variable:
<       x += y;
<       y = x - y;
<       x -= y;
<does anyone know an even simpler method?
Known as the 'XOR trick':
	x ^= y;
	y ^= x;
	x ^= y;
or even:
	#asm	XCHG x,y	/* :-) */