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  1. x = 10
  2. y = 10
  3.  
  4. main = putStrLn $ read $ (x + y)
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
[1 of 1] Compiling Main             ( prog.hs, prog.o )

prog.hs:4:26:
    No instance for (Num String)
      arising from a use of `+' at prog.hs:4:26-30
    Possible fix: add an instance declaration for (Num String)
    In the second argument of `($)', namely `(x + y)'
    In the second argument of `($)', namely `read $ (x + y)'
    In the expression: putStrLn $ read $ (x + y)
stdout
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Standard output is empty
https://ideone.com/74UJp
language:
Haskell (ghc 8.4.4)
created:
14 years ago
visibility:
public

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