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// Copyright 2020, Madhur Chauhan
// Use, modification and distribution are subject to the
// Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt
// or copy at http://www.boost.org/LICENSE_1_0.txt)
// This is an example to calculate Reciprocal Fibonacci Constant (A079586 in the OEIS)
// compile with flags: -std=c++11 -lmpfr
//[fibonacci_eg
#include <boost/math/special_functions/fibonacci.hpp>
#include <boost/multiprecision/mpfr.hpp>
#include <iomanip>
#include <iostream>
int main() {
using Real = boost::multiprecision::mpfr_float_1000;
boost::math::fibonacci_generator<Real> gen;
gen.set(1); // start producing values from 1st fibonacci number
Real ans = 0;
const int ITR = 1000;
for (int i = 0; i < ITR; ++i) {
ans += 1.0 / gen();
}
std::cout << std::setprecision(1000) << "Reciprocal fibonacci constant after "
<< ITR << " iterations is: " << ans << std::endl;
}
//]
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