18 loop(S, NextP) ->
 19     receive
 20         % the message number is above zero => forward the message to the next
 21         % process in the ring
 22         R when R > 0 -> NextP ! R,
 23             io:format(“: Proc: ~8w, Seq#: ~w, Msg#: ~w ..~n“, [self(), S, R]),
 24             loop(S, NextP);
 25         % the message number is zero => forward message and terminate
 26         R when R =:= 0 -> NextP ! R,
 27             io:format(“* Proc: ~8w, Seq#: ~w, Msg#: terminate!~n“, [self(), S]);
 28         % error: the message number is below zero => raise exception
 29         R when R < 0 ->
 30             erlang:error({“internal error”, “invalid message number”})
 31     end.

 18 loop(S, NextP) ->
 19     receive
 26         0 -> NextP ! 0,
 27             io:format(“* Proc: ~8w, Seq#: ~w, Msg#: terminate!~n“, [self(), S]);
 20         % the message number is above zero => forward the message to the next
 21         % process in the ring
 22         R -> NextP ! R,
 23             io:format(“: Proc: ~8w, Seq#: ~w, Msg#: ~w ..~n“, [self(), S, R]),
 24             loop(S, NextP);
 25         % the message number is zero => forward message and terminate
 31     end.