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    <p>1) Please write clearer questions including the compiler error, if there is one.</p> <p>2) Please include all your code, when possible. This code is missing lett2num.</p> <p>3) Some issues:</p> <p>You need to import <code>Data.Char</code> to get the <code>ord</code> and <code>chr</code> functions:</p> <pre><code>import Data.Char </code></pre> <p>Your guard on blCo is nonsensical, remove it. Also, that second definition will never run because the first one always matches, that is in <code>blCo x</code> the <code>x</code> will always match the input. So you need to rewrite blCo.</p> <p>EDIT: There's still a bit wrong here. I suggest you go on IRC and talk it out in real time so you get more understanding in addition to correct code.</p> <p>1) The typing for starters: you call a function (<code>num2bin</code>) that is supposed to return a <code>String</code> and concatenate it on a list using <code>:</code> which would result in <code>:: [String]</code>) but want to end up with only a <code>String</code>. I'm guessing you wanted to use <code>blCo xs = concatMap (num2bin . lett2num) xs</code>.</p> <p>2) <code>blCo</code> is recursive on the list but doesn't define what to do when the list hits <code>[]</code>. One option is to redefine it to use <code>concatMap</code>, making it non-recursive.</p> <p>3) You missed part of my point on importing <code>Data.Char</code>. The point is to have the full code on SO so people can copy/paste your code to help you more easily, not just that you needed it on you private copy.</p>
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    1. POhaskell. words into binary numbers
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    1. USThomas M. DuBuisson
    1. USThomas M. DuBuisson
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    1. COI edited my post. and I have already import Data.Char. I just dont understand the mistake, I dont understand why I should correct.
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    2. COsorry, I dont know what IRC is. and.. so. you suggest I better write blCo xs = (concatMap num2bin . lett2num) xs , then I should change as well num2bin :: Int -> [Int] and num2bin n | n >= 0 = reverse ( n2b n)
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    3. COKatja: Oops, see the edit, I messed up and ment `blCo xs = concatMap (num2bin . lett2num) xs`. This does not require any changes to `num2bin`. IRC is a chat system (see wikipedia), the [haskell irc channel](http://www.haskell.org/haskellwiki/IRC_channel) is popular.
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      1. USThomas M. DuBuisson
 

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