Question/hint: You refer to acc three times, all in the right-hand-side

expressions. Where is acc defined?

-jn-

On Sat, Feb 7, 2015 at 2:53 AM, Roelof Wobben <r.wobben at home.nl> wrote:

> Hello,

>

> The exercises of CIS 194 are really hard.

>

> Now I have to sum all the numbers in a array with a catch

> If a number is greater then 10 it has to be dived in single numbers.

>

> so [ 1 , 12, 3] will be [ 1, 1,2,3] and then sum up.

>

> So far I have this :

>

> -- | sum all the digits of a array

> sumDigits :: [Integer] -> Integer

> sumDigits n

> | n == 0 = acc

> | n < 10 = acc + n

> | otherwise = sumDigits acc + n `mod` 10 + n `rem` 10

>

>

> But now I see a message that acc is not known which is not wierd.

>

> But when I do sumDigits n acc I see a message that sumDigits has only 1

> parameter where I give it to,

>

> When I only had to sum up i is easy , I could use map [+] xs

>

> Anyone who can give a me tip without giving the answer otherwise I do not

> learn anything.

>

> Roelof

>

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