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From: gwyn@smoke.BRL.MIL (Doug Gwyn)
Newsgroups: comp.std.c
Subject: Re: prototypes required ?
Keywords: printf stdargs prototypes
Message-ID: <14164@smoke.BRL.MIL>
Date: 16 Oct 90 18:53:37 GMT
References: <4026@otis.oakhill.UUCP>
Organization: U.S. Army Ballistic Research Laboratory, APG, MD.
Lines: 13

In article <4026@otis.oakhill.UUCP> jeff@oakhill.UUCP (Jeff Enderwick) writes:
>Is it legal for a compilation system to require prototypes when stdarg
>functions are used ? It valid for the compiler to require you to include
>the prototype:
>	int printf ( const char*, ... );
>before making the call:
>	 printf ( "hello %d worlds\n", 5 );

Yes, you definitely must have a prototype in scope before calling a
variable-argument function in a strictly conforming program.

For printf(), you should #include <stdio.h> instead of declaring it
yourself.  You might get better results that way in some implementations.