View Compilation Error

0_0_33525473_11959.cpp: In function 'int modExp(int, int)':
0_0_33525473_11959.cpp:11:2: error: 'll' was not declared in this scope
  ll ans = 1;
  ^
0_0_33525473_11959.cpp:12:5: error: expected ';' before 'X'
  ll X = x;
     ^
0_0_33525473_11959.cpp:15:4: error: 'ans' was not declared in this scope
    ans *= X;
    ^
0_0_33525473_11959.cpp:15:11: error: 'X' was not declared in this scope
    ans *= X;
           ^
0_0_33525473_11959.cpp:18:3: error: 'X' was not declared in this scope
   X *= X;
   ^
0_0_33525473_11959.cpp:22:9: error: 'ans' was not declared in this scope
  return ans;
         ^