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  1. mean :: Fractional a => [a] -> a
  2. mean [] = 0
  3. mean lst = mean' 0 0 lst
  4.     where
  5.         mean' v l [] = v / l
  6.         mean' v l (x:xs) = mean' (v + x) (l + 1) xs
  7.  
  8. main :: IO ()
  9. main = putStrLn $ show (mean [1..4])
Success #stdin #stdout 0s 4748KB
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stdin 
Standard input is empty
stdout 
2.5
https://ideone.com/HxT46P
language:
Haskell (ghc 8.4.4)
created:
9 years ago
visibility:
public

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