Number names
Number names
You are encouraged to solve this task according to the task description, using any language you may know.
You are encouraged to solve this task according to the task description, using any language you may know.
ALGOL 68
PROC number words = (INT n)STRING:( # returns a string representation of n in words. Currently deals with anything from 0 to 999 999 999. # []STRING digits = []STRING ("zero","one","two","three","four","five","six","seven","eight","nine")[@0]; []STRING teens = []STRING ("ten","eleven","twelve","thirteen","fourteen","fifteen","sixteen","seventeen","eighteen","nineteen")[@0]; []STRING decades = []STRING ("twenty","thirty","forty","fifty","sixty","seventy","eighty","ninety")[@2]; PROC three digits = (INT n)STRING: ( # does the conversion for n from 0 to 999. # INT tens = n MOD 100 OVER 10; INT units = n MOD 10; (n >= 100|digits[n OVER 100] + " " + "hundred" + (n MOD 100 /= 0|" and "|"")|"") + (tens /= 0|(tens = 1|teens[units]|decades[tens] + (units /= 0|"-"|""))) + (units /= 0 AND tens /= 1 OR n = 0|digits[units]|"") ); INT m = n OVER 1 000 000; INT k = n MOD 1 000 000 OVER 1000; INT u = n MOD 1000; (m /= 0|three digits(m) + " million"|"") + (m /= 0 AND (k /= 0 OR u >= 100)|", "|"") + (k /= 0|three digits(k) + " thousand"|"") + ((m /= 0 OR k /= 0) AND u > 0 AND u < 100|" and " |: k /= 0 AND u /= 0|", "|"") + (u /= 0 OR n = 0|three digits(u)|"") ); on logical file end(stand in, (REF FILE f)BOOL: stop iteration); on value error(stand in, (REF FILE f)BOOL: stop iteration); DO # until user hits EOF # INT n; print("n? "); read((n, new line)); print((number words(n), new line)) OD; stop iteration: SKIP
Example input with output:
n? 43112609 forty-three million, one hundred and twelve thousand, six hundred and nine
Haskell
spellInteger :: Integer -> String spellInteger n | n < 0 = error "spellInteger: negative input" | n < 20 = small n | n < 100 = let (a, b) = n `divMod` 10 in tens a ++ nonzero '-' b | n < 1000 = let (a, b) = n `divMod` 100 in small a ++ " hundred" ++ nonzero ' ' b | otherwise = join $ map big $ reverse $ filter ((/= 0) . snd) $ zip [0..] $ unfoldr uff n where nonzero :: Char -> Integer -> String nonzero _ 0 = "" nonzero c n = c : spellInteger n join :: [String] -> String join [s] = s join (s : ss) = s ++ ", " ++ join ss uff :: Integer -> Maybe (Integer, Integer) uff 0 = Nothing uff n = let (a, b) = n `divMod` 1000 in Just (b, a) small, tens :: Integer -> String small = (["zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"] !!) . fromEnum tens = ([undefined, undefined, "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"] !!) . fromEnum big :: (Int, Integer) -> String big (0, n) = spellInteger n big (1, n) = spellInteger n ++ " thousand" big (e, n) = spellInteger n ++ ' ' : (l !! e) ++ "illion" where l = [undefined, undefined, "m", "b", "tr", "quadr", "quint", "sext", "sept", "oct", "non", "dec"]
J
u=. ;:'one two three four five six seven eight nine' v=. ;:'ten eleven twelve thirteen fourteen fifteen sixteen seventeen eighteen nineteen' t=. ;:'twenty thirty forty fifty sixty seventy eighty ninety' EN100=: '' ; u , v , , t ,&.>/ '';'-',&.>u z=. '' ; 'thousand' ; (;:'m b tr quadr quint sext sept oct non'),&.> <'illion' u=. ;:'un duo tre quattuor quin sex septen octo novem' t=. (;:'dec vigint trigint quadragint quinquagint sexagint septuagint octogint nonagint'),&.><'illion' ENU=: z , (, t ,~&.>/ '';u) , <'centillion' en3=: 4 : 0 'p q'=. 0 100#:y (p{::EN100),((*p)#' hundred'),((p*&*q)#x),q{::EN100 ) en=: 4 : 0 d=. 1000&#.^:_1 y assert. (0<:y) *. ((=<.)y) *. d <:&# ENU c=. x&en3&.> (*d)#d ((0=y)#'zero') , (-2+*{:d) }. ; , c,.(<' '),.(ENU{~I.&.|.*d),.<', ' ) uk=: ' and '&en NB. British us=: ' ' &en NB. American
Example:
uk 123456789 one hundred and twenty-three million, four hundred and fifty-six thousand, seven hundred and eighty-nine us 123456789 one hundred twenty-three million, four hundred fifty-six thousand, seven hundred eighty-nine