cmp_si.c
上传用户:qaz666999
上传日期:2022-08-06
资源大小:2570k
文件大小:2k
- /* _mpq_cmp_si -- compare mpq and long/ulong fraction.
- Copyright 2001 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"
- #include "gmp-impl.h"
- /* Something like mpq_cmpabs_ui would be more useful for the neg/neg case,
- and perhaps a version accepting a parameter to reverse the test, to make
- it a tail call here. */
- int
- _mpq_cmp_si (mpq_srcptr q, long n, unsigned long d)
- {
- /* need canonical sign to get right result */
- ASSERT (q->_mp_den._mp_size > 0);
- if (q->_mp_num._mp_size >= 0)
- {
- if (n >= 0)
- return _mpq_cmp_ui (q, n, d); /* >=0 cmp >=0 */
- else
- return 1; /* >=0 cmp <0 */
- }
- else
- {
- if (n >= 0)
- return -1; /* <0 cmp >=0 */
- else
- {
- mpq_t qabs;
- qabs->_mp_num._mp_size = ABS (q->_mp_num._mp_size);
- qabs->_mp_num._mp_d = q->_mp_num._mp_d;
- qabs->_mp_den._mp_size = q->_mp_den._mp_size;
- qabs->_mp_den._mp_d = q->_mp_den._mp_d;
- return - _mpq_cmp_ui (qabs, -n, d); /* <0 cmp <0 */
- }
- }
- }