Brent Yorgey wrote:
One comment: it looks like (add exp1 exp2), (and exp1 exp2) and so on
above
are not correct. The second argument of foldExp is a value of type Exp,
so
you are pattern-matching on the constructors of Exp, and constructors are
always uppercase. Perhaps Exp has
Yes,as I said before to other of you
the exp data type was also declared in the exercise (my fault not to say
it), and look as this:
data Exp = LitI Int
|LitB Bool
|Add Exp Exp
|And Exp Exp
|If Exp Exp Exp
--
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Hi! I'm a begginer in haskell and I have a problem with an exercise, I expect
someone could help me:
In one hand I have a declaration of an algebra data, like this:
data AlgExp a = AlgExp
{ litI :: Int - a,
litB :: Bool - a,
add :: a - a - a,
and :: a - a - a,
ifte :: a - a - a -
