[plt-scheme] solution for exercise 11.2.4

On Jun 9, 2008, at 3:53 PM, carlo ambrogio wrote:

>
> the template could be:
>
> (define (depth a-dl)
>  (cond
>    [(symbol? a-dl) ...]
>    [else ... (first a-dl) ... (depth (rest a-dl)) ...]))

If I recall the data definition you just posted correctly, this  
doesn't match it.  Which elements of the data definition are self- 
referential?  What does this imply about the template?

>
> how many clauses does the data def have? (how many clauses must the
> function def have?)
>
> I think 2 (the data can be a symbol or a list)

Yes, this part looks correct to me. It looks to me like you got the  
right number of clauses and the right number of pieces in each clause;  
it's just the very last step that needs fixing.


John Clements

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