Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!swrinde!cs.utexas.edu!sun-barr!newstop!exodus!appserv!sun!amdcad!dgcad!dg-rtp!gamecock!hagins
From: hagins@gamecock.rtp.dg.com (Jody Hagins)
Newsgroups: comp.lang.c
Subject: Re: When do you use "if ( a = b )"? (was Re: Funny mistake)
Message-ID: <1991Mar19.202118.11505@dg-rtp.dg.com>
Date: 19 Mar 91 20:21:18 GMT
References: <8148@rsiatl.Dixie.Com> <15481@smoke.brl.mil> <775@camco.Celestial.COM> <65837@eerie.acsu.Buffalo.EDU>
Sender: usenet@dg-rtp.dg.com (Usenet Administration)
Reply-To: hagins@gamecock.rtp.dg.com (Jody Hagins)
Organization: Data General Corporation, Research Triangle Park, NC
Lines: 42

In article <65837@eerie.acsu.Buffalo.EDU>, chu@acsu.buffalo.edu (john c chu) writes:
|> In article <775@camco.Celestial.COM> bill@camco.Celestial.COM (Bill Campbell) writes:
|> [concerning "if ( a = b )"
|> >Certainly it
|> >is a legal construction, but 90% of the time when I do this it
|> >was my mistake!
|> 
|> It's been my mistake everytime I've done it!! I realize that it is a
|> legal construction and I know what it does, but I was wondering...
|> Is there a good use for this?



Sure.  Any time you want to test the result of an assignment.  However,
you might want to use this instead:

if ((a = b) != 0)

The compiler SHOULD generate the same code, but you do not get the
headaches that can result from:

if (a = b)






|> 
|> 					john
|> 				chu@autarch.acsu.buffalo.edu
|> 

-- 

Jody Hagins             
hagins@gamecock.rtp.dg.com    
Data General Corp.      
62 Alexander Dr.        
RTP, N.C.  27709        
(919) 248-6035          

Nothing I ever say reflects the opinions of DGC.