/in/foo.c: In function 'main':
/in/foo.c:11:19: warning: embedded '\0' in format [-Wformat-contains-nul]
   case 8:printf("A\0");break;
                   ^
/in/foo.c:12:19: warning: embedded '\0' in format [-Wformat-contains-nul]
   case 7:printf("B\0");break;
                   ^
/in/foo.c:13:19: warning: embedded '\0' in format [-Wformat-contains-nul]
   case 6:printf("C\0");break;
                   ^
/in/foo.c:18:19: warning: embedded '\0' in format [-Wformat-contains-nul]
   case 1:printf("D\0");break;
                   ^
/in/foo.c:19:23: warning: embedded '\0' in format [-Wformat-contains-nul]
   case 0:printf("errow\0");break;
                       ^