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Language OPAL
| Date: | 04/20/05 |
| Author: | Maximilian Laiacker |
| URL: | n/a |
| Comments: | 0 |
| Info: | http://uebb.cs.tu-berlin.de/~opal/ |
| Score: |  (2.88 in 17 votes) |
-- beer.impl
-- 99 Bottles of beer recursively, writen in OPAL
-- By Maximilian Laiacker
-- the OPAL Project: http://uebb.cs.tu-berlin.de/~opal/
IMPLEMENTATION beer
IMPORT Nat COMPLETELY
Denotation COMPLETELY
NatConv ONLY `
FUN Bottles: nat -> denotation
DEF Bottles(0) == "no more bottles"
DEF Bottles(succ(0)) == "1 bottle"
DEF Bottles(n) == `(n) ++ " bottles"
-- bofb(99) to return the Songtext
DEF bofb(0) == ""
DEF bofb(n) == Bottles(n) ++ " of beer on the wall, " ++
Bottles(n) ++ " of beer. " ++
"Take one down, pass it around, " ++
Bottles(pred(n)) ++ " of beer on the wall.\n" ++ bofb(pred(n))
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