INTRODUCING A NEW FUNCTION
                      ==========================

1. FILE local.c
===============

/******************************* local_sum ***********************************/
/* function does not use parameters                                          */

double local_sum (double *par, double val1, double val2) {

    return (val1 + val2);
}


2. FILE local.h
===============

double local_sum          (double *par, double val1, double val2);


3. FILE vehicle.c
=================

    if  (!strcmp (cmd->func_name, "local_sum"))
        cmd->localfunc = local_sum;