/in/foo.cc: In function 'int main()':
/in/foo.cc:39:8: warning: unused variable 'j' [-Wunused-variable]
  int i,j;
        ^
/in/foo.cc: In function 'int mo(int)':
/in/foo.cc:36:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^