63 lines
1.8 KiB
C
63 lines
1.8 KiB
C
/*=============================================================================
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This file is part of FLINT.
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FLINT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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FLINT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FLINT; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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=============================================================================*/
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/******************************************************************************
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Copyright (C) 2011 Fredrik Johansson
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******************************************************************************/
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#include "fmpq.h"
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int
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fmpq_get_mpfr(mpfr_t r, const fmpq_t x, mpfr_rnd_t rnd)
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{
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__mpq_struct mpq;
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fmpz p, q;
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mp_limb_t pp, qq;
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p = *fmpq_numref(x);
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q = *fmpq_denref(x);
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if (p == 0)
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return mpfr_set_ui(r, 0, rnd);
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if (COEFF_IS_MPZ(p))
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mpq._mp_num = *COEFF_TO_PTR(p);
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else
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{
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pp = FLINT_ABS(p);
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mpq._mp_num._mp_alloc = 1;
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mpq._mp_num._mp_size = (p < 0) ? -1 : 1;
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mpq._mp_num._mp_d = &pp;
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}
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if (COEFF_IS_MPZ(q))
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mpq._mp_den = *COEFF_TO_PTR(q);
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else
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{
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qq = q;
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mpq._mp_den._mp_alloc = 1;
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mpq._mp_den._mp_size = 1;
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mpq._mp_den._mp_d = &qq;
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}
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return mpfr_set_q(r, &mpq, rnd);
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}
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