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(advanced with exact last verse)
| Date: | 06/27/05 |
| Author: | Kurt J. Bosch |
| URL: | n/a |
| Comments: | 1 |
| Info: | http://www.erlang.se/ |
| Score: |  (2.78 in 110 votes) |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%
%% erlang - 99 Bottles of Beer Song
%%
%% Advanced Edition (makes an exact last verse too ;-)
%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%
%% Kurt J. Bosch
%%
%% 2005/06/27
%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-module(beers).
-export([sing/0]).
sing () -> sing(99).
sing (N) -> verse( N, N ).
% ---------------------------------------------------------------------------
% the last verse
verse( 0, Nstart ) ->
line ( [
num_bottles_of_beer( 0 , u_case, bottle ),
" on the wall. " ,
num_bottles_of_beer( 0 , u_case, bottles ),
"..." ] ),
line ( [
"Go to the store and buy some more...",
num_bottles_of_beer( Nstart, l_case ) ,
"." ] );
% the other verses
verse( N, Nstart ) ->
line ( [
num_bottles_of_beer( N , u_case ),
" on the wall, " ,
num_bottles_of_beer( N , l_case ),
"." ] ),
line ( [
"Take one down and pass it around, " ,
num_bottles_of_beer( N-1 , l_case ),
" on the wall." ] ),
line ( [] ),
verse (N-1, Nstart).
% ---------------------------------------------------------------------------
line (List) ->
io:put_chars (List),
io:nl().
% ---------------------------------------------------------------------------
num_bottles_of_beer (1, Case) -> num_bottles_of_beer (1, Case, bottle );
num_bottles_of_beer (N, Case) -> num_bottles_of_beer (N, Case, bottles).
num_bottles_of_beer (N, Case, Bottle_s) ->
[ num_prefix(N), bottle(N, Case), s_postfix(Bottle_s), " of beer" ].
num_prefix (0) -> "";
num_prefix (N) -> lists:concat ( [ (N), " " ] ). % integer to string
s_postfix (bottles) -> "s";
s_postfix (bottle ) -> "".
% ---------------------------------------------------------------------------
bottle (0, Case) -> N = letter (n, Case), [ N, "o more bottle" ];
bottle (_, Case) -> B = letter (b, Case), [ B, "ottle" ].
letter (n, l_case) -> "n";
letter (n, u_case) -> "N";
letter (b, l_case) -> "b";
letter (b, u_case) -> "B".
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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Alternative Versions
| Version | Author | Date | Comments | Rate |
|---|---|---|---|---|
| Concurrent solution | Bill Clementson | 05/15/07 | 6 | |
| proper version - simple code | Håkan Stenholm | 01/23/06 | 1 | |
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