View Compilation Error

0_0_33984097_23258.cpp: In function 'int calc(int)':
0_0_33984097_23258.cpp:41:11: error: 'f' was not declared in this scope
   n /= 2, f = 1; 
           ^
0_0_33984097_23258.cpp:44:15: error: 'f' was not declared in this scope
  return sum + f;
               ^