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From: jh4o+@andrew.cmu.edu (Jeffrey T. Hutzelman)
Newsgroups: comp.sys.apple2
Subject: Re: Orca/C bug (void functions)
Message-ID: <Ec0GMRC00VpBM1Rl9n@andrew.cmu.edu>
Date: 9 Apr 91 02:25:33 GMT
References: <1991Apr6.083344.26760@rbdc>
Distribution: usa
Organization: Carnegie Mellon, Pittsburgh, PA
Lines: 48
In-Reply-To: <1991Apr6.083344.26760@rbdc>


barry@rbdc (Barry Newberry) writes:
> It appears that an old bug (feature?) has been left in Orca/C. Of course,
> I never wrote Mike (W.) about it, because I thought someone else would
> (my mistake). The compiler won't allow called functions to be type void.
> The compiler blames the next line of code for the problem. From what I've
> read, ANSI C allows functions to be type void, so I shouldn't have any
> trouble with the following program. Changing type void functions to type
> int takes care of the problems, but I like to use void for functions
> which can't have errors or don't have to return values.
> 
> /****************strange C program**************/
> void main (void)
> {
>  thing ();
> }
> 
> void thing (void)
> {
> }

This program IS erroneous.  When you called thing() without a prior
prototype, the compiler assumed it was type int.  All C compilers I
have ever seen do this.  The proper code is below:

/************* Corrected C Program *************/
void thing();

void main(void)
{
  thing();
}

void thing (void)
{
}
/***********************************************/

That should compile correctly.
> -- 
> -------------------------------------------------------------------------
>     Remember, until there is a cure for Assembly Language Brain Fry,
>       there will always be the N.C. Home for Deranged Programmers.
>  -----------------------------------------------------------------------
--------------------
Jeffrey Hutzelman			America Online: JeffreyH11
Internet: jh4o+@andrew.cmu.edu		BITNET: JHUTZ@DRYCAS
>> Apple // Forever!!! <<