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<H1>preorder traversal</H1>
<P>
(definition)

<P>
<strong>Definition:</strong>
A technique for <a href="recursion.html" tppabs="http://hissa.nist.gov/dads/HTML/recursion.html"><em>recursively</em></a> processing the  <a href="node.html" tppabs="http://hissa.nist.gov/dads/HTML/node.html"><em>nodes</em></a> of a <a href="tree.html" tppabs="http://hissa.nist.gov/dads/HTML/tree.html"><em>tree</em></a> in which the <a href="root.html" tppabs="http://hissa.nist.gov/dads/HTML/root.html"><em>root</em></a> is processed first, then any subtrees.
<P><strong>See also</strong>
<a href="inordrtrvrsl.html" tppabs="http://hissa.nist.gov/dads/HTML/inordrtrvrsl.html"><em>in-order traversal</em></a>, <a href="postordrtrvs.html" tppabs="http://hissa.nist.gov/dads/HTML/postordrtrvs.html"><em>postorder traversal</em></a>.
<P><em>Note:
For instance, if the "processing" is just printing, a tree is printed as "root (first subtree) (second subtree) ... (last subtree)." Here is pseudocode: <br> <br> postorder(tree)<br> begin<br> &nbsp;&nbsp;if tree is null, return;<br> &nbsp;&nbsp;print(tree.root);<br> &nbsp;&nbsp;postorder(tree.left_subtree);<br> &nbsp;&nbsp;postorder(tree.right_subtree);<br> end<br></em>
<P>Author: <a href="terms.html#authorPEB" tppabs="http://hissa.nist.gov/dads/terms.html#authorPEB">PEB</a>

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Entry modified Thu Jan 13 08:36:29 2000.<BR>
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