/in/foo.cc: In function 'int main()':
/in/foo.cc:35:26: warning: unused variable 'pre' [-Wunused-variable]
         int c = milk[i], pre = now;
                          ^~~
/in/foo.cc:23:18: warning: unused variable 'now1' [-Wunused-variable]
     int now = 1, now1 = 1;
                  ^~~~