Created
July 18, 2012 20:55
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Wopp!
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| wopp = map sayIt [1..] | |
| where woppln n | (mod n 7 == 0) = True | |
| | ('7' `elem` show n) = True | |
| | otherwise = False | |
| sayIt n = (if woppln n then "wopp" else show n, if direction n > 0 then "right" else "left") | |
| direction 1 = 1 | |
| direction n | woppln n = (-1) * direction (n-1) | |
| | otherwise = direction (n-1) | |
| main = do | |
| printWopp $ take 100 wopp | |
| printWopp :: [(String, String)] -> IO () | |
| printWopp [] = do return () | |
| printWopp (x:xs) = do | |
| putStrLn $ fst x ++ ", next person is " ++ snd x | |
| printWopp xs | |
| return () |
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