57 lines
1.7 KiB
C
57 lines
1.7 KiB
C
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/* mpq_set_si(dest,ulong_num,ulong_den) -- Set DEST to the retional number
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ULONG_NUM/ULONG_DEN.
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Copyright 1991, 1994, 1995, 2001, 2003 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "gmp.h"
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#include "gmp-impl.h"
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void
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mpq_set_si (MP_RAT *dest, signed long int num, unsigned long int den)
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{
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unsigned long int abs_num;
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if (GMP_NUMB_BITS < BITS_PER_ULONG)
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{
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if (num == 0) /* Canonicalize 0/d to 0/1. */
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den = 1;
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mpz_set_si (mpq_numref (dest), num);
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mpz_set_ui (mpq_denref (dest), den);
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return;
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}
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abs_num = ABS (num);
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if (num == 0)
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{
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/* Canonicalize 0/d to 0/1. */
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den = 1;
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dest->_mp_num._mp_size = 0;
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}
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else
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{
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dest->_mp_num._mp_d[0] = abs_num;
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dest->_mp_num._mp_size = num > 0 ? 1 : -1;
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}
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dest->_mp_den._mp_d[0] = den;
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dest->_mp_den._mp_size = (den != 0);
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}
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