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Daenyth/euler1.hs

Created July 22, 2010 03:55
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euler1.hs
import IO
wanted :: (Integral a) => a -> Bool
wanted x
| mod 3 x == 0 = True
| mod 5 x == 0 = True
| otherwise = False
problem1 :: (Integral a) => a -> a
problem1 x = sum $ filter wanted [1 .. x]
main = do
let answer = show $ problem1 1000 in putStrLn answer
-- prints 9 :(
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