Functions in gcc

["Abdullah M.A Hussein" <ahussein at sharjah dot ac dot ae>]

Dear Sir

Is it possible to use a function in a C program and compile it using the
gcc compiler? If yes then how can I do that? The idea is that I want to
define a new function and use it in a main program. Can I use the
following function:

mpf_t   xyz (  mpf_t a, mpf_t b )
{
   mpf_t c;   mpf_init ( c );
   mpf_set ( c, a, b );
   return c;
}

Then in the main program do I write

   mpf_set ( w, xyz( u, v ) );

How to initialize the arguments of a function?

Is there a function for calculating the exponential value (that is e to
the power of x)?


Thanks and regards

Abdullah Hussein
ahussein@sharjah.ac.ae