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  1.  
  2. sqrt' :: Double -> Double -> Double
  3. sqrt' x guess
  4.   | guessIsGoodEnough = guess
  5.   | otherwise         = sqrt' x improvedGuess
  6.   where
  7.     -- Test the precision of the guess
  8.     precision          = 1e-15
  9.     guessIsGoodEnough  = abs (guess * guess - x) < precision * x
  10.     -- Improve our guessed square
  11.     improvedGuess      = (guess + x / guess) / 2
  12.  
  13. main = putStrLn.show $ 1.0/((sqrt' 1234567899 1) + (sqrt' 1234567898 1))
  14.  
Success #stdin #stdout 0s 4728KB
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1.4230249486517707e-5
https://ideone.com/vgnp4F
language:
Haskell (ghc 8.4.4)
created:
7 years ago
visibility:
public

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