CODEWITHSUNDEEP
haskell
HaskLearner9921
HaskLearner9921

Reputation: 43

How to print function in haskell

Im trying to print the value of a factorial function however it does not work.

fac n = if n < 2 then 1 else n * fac (n-1)

main = do

    putStrLn "Enter a number: "  
    number <- getLine 
    print $ number >>= fac

Upvotes: 0

Views: 93

Answers (1)

Andrew Lei
Andrew Lei

Reputation: 335

I don't think you need the (>>=) there. Just 

print $ fac number

should be enough. However, number needs to be an Int or Integer. So you either need to use read, or, much simpler, instead of using getLine, use readLn, which will do getLine and automatically convert it to an Integral type.

Upvotes: 1

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