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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 "fmpq.h"
#include "arb.h"
#include "bernoulli.h"
void
arb_bernoulli_ui(arb_t b, ulong n, slong prec)
{
if (n < bernoulli_cache_num)
{
arb_set_fmpq(b, bernoulli_cache + n, prec);
}
else
{
int use_frac;
use_frac = (n < BERNOULLI_SMALL_NUMER_LIMIT) || (n % 2 != 0);
if (!use_frac && n < UWORD_MAX / 1000)
use_frac = (prec > bernoulli_global_prec(n));
if (use_frac)
{
fmpq_t t;
fmpq_init(t);
bernoulli_fmpq_ui(t, n);
arb_set_fmpq(b, t, prec);
fmpq_clear(t);
}
else
{
arb_bernoulli_ui_zeta(b, n, prec);
}
}
}