calculate_bounds()

void calculate_bounds	(	int	_rank,
		int	_nelmb,
		int	_size,
		int *	nstart,
		int *	nend
	)

                                                                            {
  *nstart = (_rank ) * (_nelmb/(_size));
  if(_rank == (_size-1)){
    *nend = _nelmb;
  }else {
    *nend   = (_rank +1) * (_nelmb/(_size));
  }
}