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  1. instance (Read a) => Read (IO a) where
  2.   readsPrec d s =
  3.     let xs = readsPrec d s in
  4.     let m (x, s) = (return x, s) in
  5. 	map m xs
  6.  
  7. main = do
  8.   read "123" :: IO Int
  9.   print "Hello"
  10.   x <- read "123" :: IO Int
  11.   print $ "World" ++ show x
  12.   y <- read "42"
  13.   print $ "World" ++ showInt y
  14.  
  15. showInt :: Int -> String
  16. showInt = show
Success #stdin #stdout 0.01s 5456KB
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stdin
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Standard input is empty
stdout
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"Hello"
"World123"
"World42"
https://ideone.com/1ZcLFz
language:
Haskell (ghc 8.4.4)
created:
2 years ago
visibility:
public

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