zdiv_round.c
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上传日期:2022-08-06
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- /* 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;
- }