1/* mpq_set_si(dest,ulong_num,ulong_den) -- Set DEST to the rational number 2 ULONG_NUM/ULONG_DEN. 3 4Copyright 1991, 1994, 1995, 2001, 2003 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#include "gmp-impl.h" 23 24void 25mpq_set_si (MP_RAT *dest, signed long int num, unsigned long int den) 26{ 27 unsigned long int abs_num; 28 29 if (GMP_NUMB_BITS < BITS_PER_ULONG) 30 { 31 if (num == 0) /* Canonicalize 0/d to 0/1. */ 32 den = 1; 33 mpz_set_si (mpq_numref (dest), num); 34 mpz_set_ui (mpq_denref (dest), den); 35 return; 36 } 37 38 abs_num = ABS_CAST (unsigned long, num); 39 40 if (num == 0) 41 { 42 /* Canonicalize 0/d to 0/1. */ 43 den = 1; 44 dest->_mp_num._mp_size = 0; 45 } 46 else 47 { 48 dest->_mp_num._mp_d[0] = abs_num; 49 dest->_mp_num._mp_size = num > 0 ? 1 : -1; 50 } 51 52 dest->_mp_den._mp_d[0] = den; 53 dest->_mp_den._mp_size = (den != 0); 54} 55