/in/foo.cc: In function 'int main()':
/in/foo.cc:14:20: warning: 'length' is used uninitialized in this function [-Wuninitialized]
  cout << length << " " << sum << endl;
                    ^~~
/in/foo.cc:14:27: warning: 'sum' is used uninitialized in this function [-Wuninitialized]
  cout << length << " " << sum << endl;
                           ^~~