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    <p>Assuming you just want the default style, simply adding <code>deriving Show</code> to the end of the line as below should do the job.</p> <pre><code>data Blabla = Blabla [Integer] [Char] [(Integer,Char,Char,Integer,String)] Integer deriving Show </code></pre> <p>Will work fine as all of the primitive types that Blabla is built from are "showable". For example</p> <pre><code>*Main&gt; Blabla [1,2,3] "abc" [(1,'A','B',2,"Three")] 54 Blabla [1,2,3] "abc" [(1,'A','B',2,"Three")] 54 </code></pre> <p>It might be better to build <code>Blabla</code> as a named structure</p> <pre><code> data BlaBlu = BlaBlu { theNumbers :: [Integer] , theIdentifier :: [Char] , theList :: [(Integer,Char,Char,Integer,String)] , theInteger :: Integer } deriving Show </code></pre> <p>By doing this you might be able to make the structure make more sense.</p> <pre><code>*Main&gt; BlaBlu [1,2,3] "abc" [(1,'A','B',2,"Three")] 54 BlaBlu {theNumbers = [1,2,3], theIdentifier = "abc", theList = [(1,'A','B',2,"Three")], theInteger = 54} </code></pre> <p>Do the same thing for the list structure and hopefully the code will be more readable.</p> <p>If you want to write your own instance of <code>Show</code> so you can customize it then you can remove the <code>deriving Show</code> and just write your own instance, such as:</p> <pre><code>instance Show Blabla where show (Blabla ints chars list num) = "integers = " ++ show ints ++ "\n" ++ "chars = " ++ show chars ++ "\n" ++ "specialList = " ++ show list ++ "\n" ++ "integer = " ++ show num </code></pre> <p>Where the implementation produces roughly the output you asked in the original question.</p> <pre><code>*Main&gt; Blabla [1,2,3] "abc" [(1,'A','B',2,"Three")] 54 integers = [1,2,3] chars = "abc" specialList = [(1,'A','B',2,"Three")] integer = 54 </code></pre>
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    1. COno thats not what i ask, i ask how can i show ['a','b','c'] like [a,b,c] etc.
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    2. COOK, sorry I had trouble understanding the question. I've added a little bit about how you can write your own instance of show above.
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    3. COthat was not what I want exactly, but thank for interesting...
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