Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!pt.cs.cmu.edu!andrew.cmu.edu!jdr+
From: jdr+@andrew.cmu.edu (Jeff Rosenfeld)
Newsgroups: comp.lang.c
Subject: Re: evaluation order
Message-ID: <UZ3ta3_00XcAI4hY08@andrew.cmu.edu>
Date: 14 Sep 89 12:28:51 GMT
References: <9361@attctc.Dallas.TX.US>
Distribution: na
Organization: Carnegie Mellon, Pittsburgh, PA
Lines: 25
In-Reply-To: <9361@attctc.Dallas.TX.US>

> Excerpts from netnews.comp.lang.c: 14-Sep-89 evaluation order Bob
> Calbridge@attctc.Dal (1134)

> By way of example, if I wanted to avoid the replication of 
> of strlen() in the following example:

> if (write(handle, buf, strlen(buf)) != strlen(buf)) do_something();

> by using rephrasing it like:

> if (write(handle, buf, len=strlen(buf)) != len) do_something();


What's wrong with
	len = strlen(buf);
	if (write(handle,buf,len) != len) do_something();
?

Just because C lets you do funky things doesn't mean that you have to do
them all the time. If you really want to do it in one statement you can:

	len=strlen(buf), write(handle,buf,len) != len ? do_something() : 0 ;

But hopefully you'd rather not.
			- Jeff.