[linux-help] Re: A c problem

[jlweaver <jlweaver@xxxxxxx>]

Also, If I remember correctly, you have unmatched brace.  You have a } , but
no { .


bruce wrote:

> That helps a lot.
> Thanks, Steve
> bruce
>
> > Part of the confusion is the difference between a header file and a
> > library. A header file (.h) generally contains macros or definitions
> > (#define) and/or function prototypes, type definitions, etc. It
> > generally doesn't include the code that actually implements the
> > functions. The implementation of the functions are in the libraries in
> > the form of compiled object code.
> >
> > So, if you want to use a function that exists in a library, you
> > generally must include a header file that contains the function
> > prototype and any definitions, and you must link to the object code in
> > the library during the compile process.
> >
> > The linker in gcc automatically links to the standard C library, so
> > you do not have to explicitly do that. Header files like stdio.h,
> > string.h, stdlib.h all contain definitions for stuff in the standard C
> > library. The math library, however, is not automatically linked, and
> > that is why you need to specify to gcc that you want to link to the
> > math library (-lm). Including math.h includes the definitions and
> > prototypes for the math library, but does not actually cause the
> > library to be linked.
> >
> > That will cover most, if not all, of the examples in the K&R
> > book. Basically, if you try to compile something and you get an error
> > similar to what you were getting, it probably means that you need to
> > tell gcc to link to some library. The libraries are stored in files
> > that are named something like libm.* (math library). When you use the
> > -l option on the gcc command line you skip the "lib" part. That is why
> > it is just -lm.
> >
> > I hope that helps.
> >
> > Steve
> >
> > > Thanks,
> > > bruce
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