View Compilation Error

0_0_30468264_32615.cpp: In function 'int main()':
0_0_30468264_32615.cpp:50:3: error: 'len' was not declared in this scope
   len=str.length();
   ^
0_0_30468264_32615.cpp:98:7: error: 'f' was not declared in this scope
    if(f&1) cout<<f/2+1<<endl;
       ^