gcc/gmp/tests/rand/zdiv_round.c

/* zdiv_round() -- divide integers, round to nearest */

/*
Copyright 1999 Free Software Foundation, Inc.

This file is part of the GNU MP Library.

The GNU MP Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or (at your
option) any later version.

The GNU MP Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
License for more details.

You should have received a copy of the GNU Lesser General Public License
along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */

#include "gmp.h"

void
zdiv_round (mpz_t rop, mpz_t n, mpz_t d)
{
  mpf_t f_n, f_d;

  mpf_init (f_n);
  mpf_init (f_d);

  mpf_set_z (f_d, d);
  mpf_set_z (f_n, n);

  mpf_div (f_n, f_n, f_d);
  mpf_set_d (f_d, .5);
  if (mpf_sgn (f_n) < 0)
    mpf_neg (f_d, f_d);
  mpf_add (f_n, f_n, f_d);
  mpz_set_f (rop, f_n);

  mpf_clear (f_n);
  mpf_clear (f_d);
  return;
}