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From: ark@alice.UUCP (Andrew Koenig)
Newsgroups: net.lang.c
Subject: Re: condition convention 'if (10 == j)...'
Message-ID: <3673@alice.UUCP>
Date: Tue, 30-Apr-85 10:10:55 EDT
Article-I.D.: alice.3673
Posted: Tue Apr 30 10:10:55 1985
Date-Received: Wed, 1-May-85 03:28:27 EDT
References: <332@cubsvax.UUCP>
Organization: Bell Labs, Murray Hill
Lines: 13

> Just that instead of writing, in the traditional manner,
>	if(pc=malloc(nbytes)==NULL)...
> you have to insert extra parens if you use the other form:
>	if(NULL==(pc=malloc(nbytes)))..
> This is because == has higher precedence than =, and the expression will
> first evaluate NULL==pc, then try to set the resulting constant to whatever 
> malloc() returns (except, of course, the compiler doesn't let you get that far).

If you write
	if(pc=malloc(nbytes)==NULL)...
that will set pc to 1 if malloc succeeds and 0 if it fails.
You need the parens anyway:
	if((pc=malloc(nbytes)==NULL)...