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<div class="moz-cite-prefix">Thanks, <br>
<br>
I already found the answer. <br>
The problem is that I use the wrong clauses and the wrong approach
to recursion.<br>
<br>
Roelof<br>
<br>
<br>
<br>
Joel Neely schreef op 7-2-2015 om 14:42:<br>
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cite="mid:CAEEzXAjSEykjj4h2vGRY-Sp+0hS6miYRhe9AP7RSMVmOEh=mGg@mail.gmail.com"
type="cite">
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<div class="gmail_default"
style="font-family:georgia,serif;font-size:small">Question/hint:
You refer to acc three times, all in the right-hand-side
expressions. Where is acc defined?</div>
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style="font-family:georgia,serif;font-size:small"><br>
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<div class="gmail_default"
style="font-family:georgia,serif;font-size:small">-jn-</div>
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<div class="gmail_extra"><br>
<div class="gmail_quote">On Sat, Feb 7, 2015 at 2:53 AM, Roelof
Wobben <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:r.wobben@home.nl" target="_blank">r.wobben@home.nl</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Hello,<br>
<br>
The exercises of CIS 194 are really hard.<br>
<br>
Now I have to sum all the numbers in a array with a catch<br>
If a number is greater then 10 it has to be dived in single
numbers.<br>
<br>
so [ 1 , 12, 3] will be [ 1, 1,2,3] and then sum up.<br>
<br>
So far I have this :<br>
<br>
-- | sum all the digits of a array<br>
sumDigits :: [Integer] -> Integer<br>
sumDigits n<br>
| n == 0 = acc<br>
| n < 10 = acc + n<br>
| otherwise = sumDigits acc + n `mod` 10 + n `rem` 10<br>
<br>
<br>
But now I see a message that acc is not known which is not
wierd.<br>
<br>
But when I do sumDigits n acc I see a message that sumDigits
has only 1 parameter where I give it to,<br>
<br>
When I only had to sum up i is easy , I could use map [+] xs<br>
<br>
Anyone who can give a me tip without giving the answer
otherwise I do not learn anything.<br>
<br>
Roelof<br>
<br>
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