ackermann.cc

double ackermann(double m, double n) {
	if (m == 0) {
		return n + 1;
	} else if (n == 0) {
		return ackermann(m - 1, 1);
	}
	
	return ackermann(m - 1, ackermann(m, n - 1));
}

int main(int argc, char const *argv[]) {
	cout << ackermann(1, 4) << endl; // Output: 6
	return 0;
}