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Category
real language
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Language Clean
(Pure, lazy, functional)
| Date: | 04/19/07 |
| Author: | Peter Achten |
| URL: | http://cs.ru.nl/P.Achten/ |
| Comments: | 0 |
| Info: | http://clean.cs.ru.nl/ |
| Score: |  (2.94 in 17 votes) |
module bottles99
// Compile with Clean 2.2 (http://clean.cs.ru.nl/) with Project:Project Options:No Return Type
import StdEnv
Start :: *World -> *World
Start world
# (stdio,world) = stdio world
# (_, world) = fclose (fwrites (foldr (+) "" [sing nr \\ nr<-[99,98..0]]) stdio) world
= world
the_wall = " on the wall"
sing :: Int -> String
sing n = capitalize (bottles n) + the_wall + ", " + bottles n + ".\n"
+
if (n==0)
("Go to the store and buy some more, " + bottles 99 + the_wall + ".\n")
("Take one down and pass it around, " + bottles (n-1) + the_wall + ".\n\n")
bottles 0 = "no more bottles of beer"
bottles n = toString n + " bottle" + if (n==1) "" "s" + " of beer"
capitalize :: String -> String
capitalize str = toString (cap str.[0]) + str%(1,size str-1)
cap :: Char -> Char
cap c = if (isMember c ['a'..'z'])
(hd [['A'..'Z']!!i \\ c`<-['a'..'z'] & i<-[0..] | c`==c])
c
instance + String where (+) a b = a +++ b // shorthand notation + instead of +++
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