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/*=============================================================================
This file is part of FLINT.
FLINT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
FLINT 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with FLINT; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
=============================================================================*/
/******************************************************************************
Copyright (C) 2011 Sebastian Pancratz
******************************************************************************/
#include "fmpq.h"
void
fmpq_set_fmpz_frac(fmpq_t res, const fmpz_t p, const fmpz_t q)
{
if (fmpz_is_zero(p))
{
fmpq_zero(res);
}
else if (fmpz_is_pm1(q) || fmpz_is_pm1(p))
{
if (fmpz_sgn(q) < 0)
{
fmpz_neg(fmpq_numref(res), p);
fmpz_neg(fmpq_denref(res), q);
}
else
{
fmpz_set(fmpq_numref(res), p);
fmpz_set(fmpq_denref(res), q);
}
}
else
{
fmpz_t t;
fmpz_init(t);
fmpz_gcd(t, p, q);
if (fmpz_is_one(t))
{
fmpz_set(fmpq_numref(res), p);
fmpz_set(fmpq_denref(res), q);
}
else
{
fmpz_divexact(fmpq_numref(res), p, t);
fmpz_divexact(fmpq_denref(res), q, t);
}
if (fmpz_sgn(fmpq_denref(res)) < 0)
{
fmpz_neg(fmpq_numref(res), fmpq_numref(res));
fmpz_neg(fmpq_denref(res), fmpq_denref(res));
}
fmpz_clear(t);
}
}
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