zdiv_round.c revision 1.1.1.4 
1/* zdiv_round() -- divide integers, round to nearest */
2
3/*
4Copyright 1999 Free Software Foundation, Inc.
5
6This file is part of the GNU MP Library test suite.
7
8The GNU MP Library test suite is free software; you can redistribute it
9and/or modify it under the terms of the GNU General Public License as
10published by the Free Software Foundation; either version 3 of the License,
11or (at your option) any later version.
12
13The GNU MP Library test suite is distributed in the hope that it will be
14useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
15MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
16Public License for more details.
17
18You should have received a copy of the GNU General Public License along with
19the GNU MP Library test suite.  If not, see https://www.gnu.org/licenses/.  */
20
21
22void
23zdiv_round (mpz_t rop, mpz_t n, mpz_t d)
24{
25  mpf_t f_n, f_d;
26
27  mpf_init (f_n);
28  mpf_init (f_d);
29
30  mpf_set_z (f_d, d);
31  mpf_set_z (f_n, n);
32
33  mpf_div (f_n, f_n, f_d);
34  mpf_set_d (f_d, .5);
35  if (mpf_sgn (f_n) < 0)
36    mpf_neg (f_d, f_d);
37  mpf_add (f_n, f_n, f_d);
38  mpz_set_f (rop, f_n);
39
40  mpf_clear (f_n);
41  mpf_clear (f_d);
42  return;
43}
44