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