On Wed, 9 May 2012, Angus Comber wrote:
I am trying to create a factorial function in GHC. I am following the
online learnyouahaskell.com book (specifically types-and-typeclasses
page).
Bear in mind this is my day 1 of learning Haskell.
Then beginn...@haskell.org might be a better place to ask, since
haskell@haskell.org is for announcements.
The book suggests:
factorial :: Integer - Integer
factorial n = product [1..n]
But if I enter first line then press Enter I see:
interactive:1:1 Not in scope: 'factorial'
What am I doing wrong?
The code you entered is intended to be the content of a text file that can
be loaded into GHCi or Hugs. If you want to write it immediately into GHCi
you may write:
Prelude let factorial :: Integer - Integer; factorial n = product [1..n]
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