pqc/external/flint-2.4.3/examples/delta_qexp.cpp
2014-05-24 23:16:06 +02:00

60 lines
1.8 KiB
C++

/*=============================================================================
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) 2007 David Harvey, William Hart
Copyright (C) 2010 Sebastian Pancratz
Copyright (C) 2013 Tom Bachmann (C++ adaptation)
******************************************************************************/
/*
Demo FLINT program for computing the q-expansion of the delta function.
*/
#include <iostream>
#include <cstdlib>
#include "fmpzxx.h"
#include "arithxx.h"
using namespace flint;
using namespace std;
int main(int argc, char* argv[])
{
slong N = 0;
if (argc == 2)
N = atol(argv[1]);
if (argc != 2 || N < 1)
{
flint_printf("Syntax: delta_qexp <integer>\n");
flint_printf("where <integer> is the (positive) number of terms to compute\n");
return 1;
}
std::cout << "Coefficient of q^" << N << " is "
<< ramanujan_tau(fmpzxx(N)) << '\n';
return 0;
}