[plt-scheme] multiply-by-pi HTDP 11.5.2

I think you're forgetting the template (and, judging from the below you
maybe missed your contract & purpose). You're right that that approach
won't work, but maybe you can find another way to use your inputs.

Robby

At Tue, 20 Jun 2006 19:50:20 +0100, "wooks wooks" wrote:
> 
> http://www.htdp.org/2003-09-26/Book/curriculum-Z-H-15.html#node_sec_11.5
> 
> I can only solve this problem by using + for  the recursion. because my add 
> function only works when at least one of the inputs is a natural number - 
> i.e
> 
> (define (add m n)
>   (cond
>     [(zero? n) m]
>     [else (add1 (add m (sub1 n)))]
>     )
>   )
> 
> which will obvious not work for the required recursion (add pi 
> (multiply-by-pi (- n 1))).
> 
> 
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