[plt-scheme] Help: I want to travel a binary tree?

Why don't you define a tree like this

(1 (2 (4 () ()) (5 () ())) (3 (6 () ()) (7 () ()))

?

--Hans



Op 31/7/2007 schreef "Zeng Fucen" <zengfucen at gmail.com>:

>I'm a scheme novice,
>
>I want to travel a binary tree, how to ? (depth first)
>
>Thanks for your tips , first!
>
>I define a tree like this:  (1 (2 4 5) (3 6 7))
>
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