View Compilation Error

0_0_17742109_20124.cpp: In function 'int main()':
0_0_17742109_20124.cpp:31:16: error: 'len' was not declared in this scope
         memset(len, 0, sizeof(len));
                ^
0_0_17742109_20124.cpp:40:5: error: expected ';' before '}' token
     }
     ^