/in/foo.cc: In function 'int hw(int)':
/in/foo.cc:32:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (i = 0; i < x.length() / 2; i++) {
                ^
/in/foo.cc:36:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^