mirror of
https://github.com/vale981/arb
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56 lines
1.7 KiB
C
56 lines
1.7 KiB
C
/*=============================================================================
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This file is part of ARB.
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ARB 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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ARB 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 ARB; 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) 2012 Fredrik Johansson
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******************************************************************************/
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#include "fmpr.h"
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void
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fmpr_get_fmpq(fmpq_t y, const fmpr_t x)
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{
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if (fmpr_is_zero(x))
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{
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fmpq_zero(y);
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}
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else if (fmpr_is_special(x) || COEFF_IS_MPZ(*fmpr_expref(x)))
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{
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printf("exception: fmpr_get_fmpq: cannot convert to rational\n");
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abort();
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}
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else
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{
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long exp = *fmpr_expref(x);
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fmpz_set_ui(fmpq_denref(y), 1UL);
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if (exp >= 0)
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{
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fmpz_mul_2exp(fmpq_numref(y), fmpr_manref(x), exp);
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}
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else
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{
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fmpz_set(fmpq_numref(y), fmpr_manref(x));
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fmpz_mul_2exp(fmpq_denref(y), fmpq_denref(y), -exp);
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}
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}
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}
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