lab 11 z2 ALL RIGHT)

#include <iostream>
#include <cmath>

using namespace std;

double rec(long);

int main()
{
    long n;
    cout << "Enter n: " << endl;
    cin >> n;
    double x;
    x = rec(n);
    cout << "Your result: " << 1.0/3 + (n*n)/x << endl;
    return 0;
}

double rec(long i)
{
    static long n = i;
    if (i == 1)
    {
        return (1.0 /3);
    }
    else
    {
        return (1.0 / (pow(3, i))) * rec(i - 1);
    }
}