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/*
Copyright (C) 2013 Fredrik Johansson
This file is part of FLINT.
FLINT 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 3 of the License, or
(at your option) any later version. See <https://www.gnu.org/licenses/>.
*/
#include "arb.h"
void
arb_bin_ui(arb_t x, const arb_t n, ulong k, slong prec)
{
if (k == 0)
{
arb_one(x);
}
else if (k == 1)
{
arb_set_round(x, n, prec);
}
else
{
arb_t t, u;
arb_init(t);
arb_init(u);
arb_sub_ui(t, n, k - 1, prec);
arb_rising_ui(t, t, k, prec);
arb_fac_ui(u, k, prec);
arb_div(x, t, u, prec);
arb_clear(t);
arb_clear(u);
}
}
void
arb_bin_uiui(arb_t x, ulong n, ulong k, slong prec)
{
arb_t t;
arb_init(t);
arb_set_ui(t, n);
arb_bin_ui(x, t, k, prec);
arb_clear(t);
}