set_ui.c
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上传日期:2022-08-06
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- /* mpq_set_ui(dest,ulong_num,ulong_den) -- Set DEST to the rational number
- ULONG_NUM/ULONG_DEN.
- Copyright 1991, 1994, 1995, 2001, 2002, 2003 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"
- void
- mpq_set_ui (MP_RAT *dest, unsigned long int num, unsigned long int den)
- {
- if (GMP_NUMB_BITS < BITS_PER_ULONG)
- {
- if (num == 0) /* Canonicalize 0/d to 0/1. */
- den = 1;
- mpz_set_ui (mpq_numref (dest), num);
- mpz_set_ui (mpq_denref (dest), den);
- return;
- }
- if (num == 0)
- {
- /* Canonicalize 0/n to 0/1. */
- den = 1;
- dest->_mp_num._mp_size = 0;
- }
- else
- {
- dest->_mp_num._mp_d[0] = num;
- dest->_mp_num._mp_size = 1;
- }
- dest->_mp_den._mp_d[0] = den;
- dest->_mp_den._mp_size = (den != 0);
- }