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99 Bottles of Beer on the Wall

99 Bottles of Beer | Language Erlang -module(beersong). -export([sing/0]). -define(TEMPLATE_0, "~s of beer on the wall, ~s of beer.~nGo to the store and buy some more, 99 bottles of beer on the wall.~n"). -define(TEMPLATE_N, "~s of beer on the wall, ~s of beer.~nTake one down and pass it around, ~s of beer on the wall.~n~n"). create_verse(0) -> {0, io_lib:format(?TEMPLATE_0, phrase(0))}; create_verse(Bottle) -> {Bottle, io_lib:format(?TEMPLATE_N, phrase(Bottle))}. phrase(0) -> ["No more bottles", "no more bottles"]; phrase(1) -> ["1 bottle", "1 bottle", "no more bottles"]; phrase(2) -> ["2 bottles", "2 bottles", "1 bottle"]; phrase(Bottle) -> lists:duplicate(2, integer_to_list(Bottle) ++ " bottles") ++ [integer_to_list(Bottle-1) ++ " bottles"]. bottles() -> lists:reverse(lists:seq(0,99)). sing() -> lists:foreach(fun spawn_singer/1, bottles()), sing_verse(99). spawn_singer(Bottle) -> Pid = self(), spawn(fun() -> Pid ! create_verse(Bottle) end). sing_verse(Bottle) -> receive {_, Verse} when Bottle == 0 -> io:format(Verse); {N, Verse} when Bottle == N -> io:format(Verse), sing_verse(Bottle-1) after 3000 -> io:format("Verse not received - re-starting singer~n"), spawn_singer(Bottle), sing_verse(Bottle) end.

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