Haskell Error - Naked Expression at Top Level

Question

I have the following code:

fib n
    | n == 0  = 0
    | n == 1  = 1
    | n > 1  = fib (n-1) + fib (n-2)

print fib 5

And for some reason,

Answer 1

You cannot have an expression at the top-level. Haskell program entry point is a main function in Main module. Also print fib 5 calls print with two arguments, you need to do:

main = print $ fib 5

or

main = print (fib 5)