func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     int t;     cin >> t;     long long int a, b, n;     while (t--) {       cin >> a >> b >> n;       n %= 3;       if (n == 0)         cout << a << endl;       else if (n == 1)         cout << b << endl;       else         cout << (a ^ b) << endl;     }   }   