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
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
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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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
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@haskell.org http://www.haskell.org/mailman/listinfo/beginners
-- Beauty of style and harmony and grace and good rhythm depend on simplicity. - Plato
participants (3)
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Joel Neely -
Roelof Wobben -
yi lu