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Recursive / Non-Recursive Function

James Dekker
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Joined: Dec 09, 2006
Posts: 219
What is the best way to write a recursive and non-recursive solution for a binary tree in order traversal?
Stan James
(instanceof Sidekick)
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Joined: Jan 29, 2003
Posts: 8791
Work this with pencil and paper first and see how it goes.

What are the rules to visit in order? Something like:

1 Go left as long as you can
2 Go back to the last place you haven't gone right yet
3 Go right
4 Repeat from 1

First make a "Node" with "left" and "right" variables that refer to other nodes. Set up the 1,2,3 nodes. See if you write "go left as long as you can" in a loop. Then we'll worry about the next steps.

Take a shot at this in code and show us what you make. If you get stuck, then we'll know right where to help.

A good question is never answered. It is not a bolt to be tightened into place but a seed to be planted and to bear more seed toward the hope of greening the landscape of the idea. John Ciardi
Don't get me started about those stupid light bulbs.
subject: Recursive / Non-Recursive Function