Matthews-MacBook-Pro:cs_class matthewlarson$ ghci Composition.hs
GHCi, version 8.6.5: http://www.haskell.org/ghc/  :? for help
[1 of 1] Compiling Main             ( Composition.hs, interpreted )
Ok, one module loaded.
*Main> even 2
True
*Main> even 6
True
*Main> even 7
False
*Main>