/in/foo.cc: In function 'int main()':
/in/foo.cc:36:11: warning: 'o' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<o<<" "<<j<<endl;
           ^~~
/in/foo.cc:36:16: warning: 'j' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<o<<" "<<j<<endl;
                ^