CODEWITHSUNDEEP
haskell
Aeglen
Aeglen

Reputation: 15

Haskell "Unresolved Overloading"

The following code to enumerate "backwards binary"

bin :: [Char] -> Int
bin a = temp (a, 1)
    where
        temp :: ([Char], Int) -> Int
        temp ([], n) = 0
        temp (('1':x), n) = temp(x, (n*2)) + 1*n
        temp (('0':x), n) = temp(x, (n*2))

produces the following error:

 TYPE - Unresolved Overloading
 *** Type       : Num [Char] => Int
 *** Expression : Bin 1001

Similar code worked fine when it was [Int] -> Int, I have no idea why it doesn't work this way.

Upvotes: 0

Views: 295

Answers (1)

syntagma
syntagma

Reputation: 24334

You are using the function with incorrect type, that is Int (1001) when it really epects [Char], e.g. bin ['1','0','0','1'].

Upvotes: 1

Related Questions