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From: gostas@kuling.UUCP (G|sta Simil{/ml)
Newsgroups: net.lang.c
Subject: Re: how has C bitten you?
Message-ID: <797@kuling.UUCP>
Date: Sat, 31-Aug-85 19:15:34 EDT
Article-I.D.: kuling.797
Posted: Sat Aug 31 19:15:34 1985
Date-Received: Thu, 5-Sep-85 06:53:20 EDT
References: <228@investor.UUCP> <132@mcgill-vision.UUCP> <2702@sun.uucp>
Reply-To: gostas@kuling.UUCP (G|sta Simil{/ml)
Organization: The Royal Inst. of Techn., Stockholm
Lines: 27

In article <2702@sun.uucp> guy@sun.uucp (Guy Harris) writes:

>Procedure calls, however, are not such a context, so the
>two procedure calls in
>
>	bar(0);
>	bar((struct frobozz *)0);
>
>are very definitely *not* equivalent.  In ANSI Standard C, there is a syntax
>to specify that "bar" takes an argument of type "struct frobozz *"; if you
>declared "bar" in such a manner, the two procedure calls would be equivalent.
>
>	Guy Harris

Is it also possible to give a NULL-pointer to a procedure as a parameter,
if for example the procedure would return several values, and we are not
interested in all of them?

wait(0) works at least here (4.2BSD), but something like this does not:

skip(fd, n)	/* skip n bytes om streams that don't allow lseek() */
int fd, n;
{
	(void)read(fd, 0, n);
}

		G|sta Simil{		gostas@kuling.UUCP