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  1. count c l = length $ filter (c==) l
  2.  
  3. main = do 
  4.         l <- getLine
  5.         let
  6.                 f = count '(' l
  7.                 s = count ')' l
  8.         in
  9.         print $ f s (f==s)
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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(x0 + x20n - ((r - r2)*(r + r2)*(x0 - x20n))/(Power(x0 - x20n,2) + Power(y0 – y20n,2)))/2.
compilation info 
[1 of 1] Compiling Main             ( prog.hs, prog.o )

prog.hs:5:8:
    The last statement in a 'do' construct must be an expression
stdout
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Standard output is empty
https://ideone.com/yRGDk
language:
Haskell (ghc 8.4.4)
created:
11 years ago
visibility:
public

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