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cdsmith/sqrt.hs

Last active November 6, 2018 08:01
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sqrt.hs
fixpoint :: Eq a => (a -> a) -> a -> a
fixpoint f x
| x == fx = fx
| otherwise = fixpoint f fx
where fx = f x
mySqrt :: Double -> Double
mySqrt n = fixpoint (\x -> (x + n/x) / 2) 1
main :: IO ()
main = print (mySqrt 10)
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