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{-
Usage:
$ runhaskell gcd.hs 22 11
11
or:
$ ghc gcd.hs -o gcd-hs
$ ./gcd-hs 11 22 121
11
-}
import System.Environment (getArgs)
gcd2 :: Integral a => a -> a -> a
gcd2 a 0 = a
gcd2 a b = gcd2 b (a `rem` b)
gcdn :: Integral a => [a] -> a
gcdn = foldl1 gcd2
out :: [String] -> IO ()
out [] = return ()
out a = print (gcdn (map read a) :: Integer)
main :: IO ()
main = getArgs >>= out
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