Re: [Dev-C++] Problems with compiling

[Per W. <pw...@ia...>]

NULL is a symbol defined in the standard header files. Hence, any c file
that makes use of the NULL symbol needs to include any of the standard
headers that will define NULL.

/pwm

On Sun, 20 May 2007, Jan Mura wrote:

> Well, it really works now. Anyway I do not understand it at all, it had
> problem only with this NULL and no function from standard headers I use
> there.
>
> But thank you very much.
>
> Jan Mura .
>
> ----- Original Message -----
> From: "Per Westermark" <pw...@ia...>
> To: "Jan Mura" <jan...@vo...>
> Cc: <dev...@li...>
> Sent: Sunday, May 20, 2007 7:42 PM
> Subject: Re: [Dev-C++] Problems with compiling
>
>
> > It isn't enough to include andy standard header files in one of your c
> > files.
> >
> > All c files that contains references to functions from the standard
> > library, or functions from other c files must include the relevant header
> > files.
> >
> > /pwm
> >
> > On Sun, 20 May 2007, Jan Mura wrote:
> >
> > > Hello,
> > >
> > > I would like to ask something about compiling of files under gcc.exe
> > > (Dev-Cpp on Win XP).
> > > Iam trying to compile two files which should produce one executable
> file.
> > > One of the file is main.c in which I include all
> > > standard headers and header file for main and the other source file.
> > >
> > > And under console I am trying to do something like:
> > >
> > > gcc.exe main.c bet_list.c -o ruleta.exe
> > >
> > > And the output is like:
> > > bet_list.c: In function `print_list':
> > > bet_list.c:9: error: `NULL' undeclared (first use in this function)
> > > bet_list.c:9: error: (Each undeclared identifier is reported only once
> > > bet_list.c:9: error: for each function it appears in.)
> > > bet_list.c: In function `empty_list':
> > > bet_list.c:30: error: `NULL' undeclared (first use in this function)
> > > bet_list.c: In function `in_list':
> > > bet_list.c:77: error: `NULL' undeclared (first use in this
> > > ...
> > > and so on for every NULL in bet_list.c
> > >
> > > If I compile just bet_list.c and I include the main() function in this
> file
> > > together with including the standard headers, the compilation is without
> > > errors.
> > > I think the NULL is declared in stdlib.h which I include of course.
> > >
> > > Thank you for your hints.
> > >
> > > Jan Mura
> > > jan...@vo...
> > >
> > >
> >
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