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/*
Copyright (C) 2016 Fredrik Johansson
This file is part of Arb.
Arb is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version. See <http://www.gnu.org/licenses/>.
*/
#include "arb.h"
void
arb_sgn(arb_t res, const arb_t x)
{
if (arb_is_zero(x))
{
arb_zero(res);
}
else if (arb_contains_zero(x))
{
arf_zero(arb_midref(res));
mag_one(arb_radref(res));
}
else
{
arb_set_si(res, arf_sgn(arb_midref(x)));
}
}
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