zdiv_round.c revision 1.1.1.1 
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.
7
8The GNU MP Library is free software; you can redistribute it and/or modify
9it under the terms of the GNU Lesser General Public License as published by
10the Free Software Foundation; either version 3 of the License, or (at your
11option) any later version.
12
13The GNU MP Library is distributed in the hope that it will be useful, but
14WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
16License for more details.
17
18You should have received a copy of the GNU Lesser General Public License
19along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */
20
21#include "gmp.h"
22
23void
24zdiv_round (mpz_t rop, mpz_t n, mpz_t d)
25{
26  mpf_t f_n, f_d;
27
28  mpf_init (f_n);
29  mpf_init (f_d);
30
31  mpf_set_z (f_d, d);
32  mpf_set_z (f_n, n);
33
34  mpf_div (f_n, f_n, f_d);
35  mpf_set_d (f_d, .5);
36  if (mpf_sgn (f_n) < 0)
37    mpf_neg (f_d, f_d);
38  mpf_add (f_n, f_n, f_d);
39  mpz_set_f (rop, f_n);
40
41  mpf_clear (f_n);
42  mpf_clear (f_d);
43  return;
44}
45