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Date: Sun, 16 Jan 2000 13:12:24 -0800
From: Alfred Perlstein <bright@wintelcom.net>
To: Marty Leisner <leisner@rochester.rr.com>
Cc: "Alexey N. Dokuchaev" <danfe@ssc.nsu.ru>,
	freebsd-questions@FreeBSD.ORG
Subject: Re: (void)printf(); (Was: Re: simple c i/o question)
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References: <20000113030235.Z9397@fw.wintelcom.net> <200001162043.PAA10900@rochester.rr.com>
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* Marty Leisner <leisner@rochester.rr.com> [000116 13:06] wrote:
> 
> 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.

gcc (or maybe some other older compiler) used to be able to flag this,
I admit that I don't use it that often, but sometimes it just makes sense.

It would probably better serve people if the code in question had a comment
explaining _why_ the return value is ignored.

-Alfred


> 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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> 

-- 
-Alfred Perlstein - [bright@wintelcom.net|alfred@freebsd.org]


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