# sum problem

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## sum problem

 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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## sum problem

 Do not try to `sum` all at first. See how you can deal with one integer. On Sat, Feb 7, 2015 at 4:53 PM, Roelof Wobben 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 > > _______________________________________________ > Beginners mailing list > Beginners at haskell.org > http://www.haskell.org/mailman/listinfo/beginners> -------------- next part -------------- An HTML attachment was scrubbed... URL:
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## sum problem

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