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NumbersIntoWords.hs
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/
NumbersIntoWords.hs
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module NumbersIntoWords where
units :: [String]
units =
[ "zero"
, "one"
, "two"
, "three"
, "four"
, "five"
, "six"
, "seven"
, "eight"
, "nine"
]
teens :: [String]
teens =
[ "ten"
, "eleven"
, "twelve"
, "thirteen"
, "fourteen"
, "fifteen"
, "sixteen"
, "seventeen"
, "eighteen"
, "nineteen"
]
tens :: [String]
tens =
["twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"]
convert1 :: Int -> String
convert1 n = units !! n
convert2 :: Int -> String
convert2 n
| t == 0 = convert1 n
| t == 1 = teens !! u
| u == 0 = tens !! (t - 2)
| otherwise = tens !! (t - 2) ++ " " ++ convert1 u
where
(t, u) = (n `div` 10, n `rem` 10)
convert3 :: Int -> String
convert3 n
| h == 0 = convert2 t
| t == 0 = convert1 h ++ " hundred"
| otherwise = convert1 h ++ " hundred and " ++ convert2 t
where
(h, t) = (n `div` 100, n `rem` 100)