View Compilation Error

0_0_28480246_13377.cpp: In function 'void hanoi(int, int, int, int)':
0_0_28480246_13377.cpp:8:3: error: 'ans' was not declared in this scope
   ans++;
   ^
0_0_28480246_13377.cpp:12:2: error: 'ans' was not declared in this scope
  ans++;
  ^