Date: Sun, 16 Jan 2000 15:43:35 -0500 From: "Marty Leisner" <leisner@rochester.rr.com> To: Alfred Perlstein <bright@wintelcom.net> Cc: "Alexey N. Dokuchaev" <danfe@ssc.nsu.ru>, freebsd-questions@FreeBSD.ORG, leisner@rochester.rr.com Subject: Re: (void)printf(); (Was: Re: simple c i/o question) Message-ID: <200001162043.PAA10900@rochester.rr.com> In-Reply-To: Your message of "Thu, 13 Jan 2000 03:02:36 PST." <20000113030235.Z9397@fw.wintelcom.net>
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Most cases of casting things like printf is to shut up lint.
IMHO this is very bad practice, you shouldn't have unneeded symbols.
Just for a quick note, gcc -Wall -W (2.95.2) doesn't complain on
this program:
: leisner@soyata;cat foo.c
#include <stdio.h>
int main(void)
{
printf("hello world\n");
exit(0);
}
I don't know if gcc has an option to flag this...but write uncluttered code.
Marty Leisner
Alfred Perlstein <bright@wintelcom.net> writes on Thu, 13 Jan 2000 03:02:36 PS
T
> * Alexey N. Dokuchaev <danfe@ssc.nsu.ru> [000112 23:54] wrote:
> > On Wed, 12 Jan 2000, Naief BinTalal wrote:
> >
> > > On Wed, Jan 12, 2000 at 04:28:23PM +0000, Jonathon McKitrick wrote:
> > > >
> > > > I'm trying to write a hello world program. What is the output
file for
> > > > the console currently being displayed (in other words, the
screen)?
> > > > I've tried printf, and fprintf to stdout and stderr.
> > >
> > > #include <stdio.h>
> > >
> > > int
> > > main(void)
> > > {
> > > (void)fprintf(stdout,"Hello World\n");
> > > return 0;
> > > }
> > >
> >
> > While browsing thru the source code of almost anything in FreeBSD,
I've
> > noticed that (type)function(parameters); syntax. Why not just to
write
> > function(paramenters). Like in the prev example, what's wrong with
simple
> > printf(blahblah); but (void)printf(blahblah); ?
>
> Nothing really, it's my preference to only use void when I mean:
>
> "i know this function returns something that may be interesting, but
frankly
> I don't care at this point"
>
> using it for things like printf is a bit much, but it sort of let's the
> next guy know that you didn't miss something.
>
> I also remember hearing that older compilers had an option to complain
> about code that didn't do something with return values.
>
> -Alfred
>
>
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