/*=============================================================================

    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 Fredrik Johansson

******************************************************************************/

#include "fmpq.h"

void fmpq_inv(fmpq_t dest, const fmpq_t src)
{
    fmpz tmp;

    if (dest != src)
    {
        fmpq_set(dest, src);
    }

    tmp = dest->num;
    dest->num = dest->den;
    dest->den = tmp;

    if (fmpz_sgn(&dest->den) < 0)
    {
        fmpz_neg(&dest->den, &dest->den);
        fmpz_neg(&dest->num, &dest->num);
    }
}