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Preorder and Postorder Traversal of Rooted Trees

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Many algorithms that make use of trees often traverse the tree in some order, that is, they visit each vertex in a systematic way. Two commonly used traversals are preorder and postorder. A preorder traversal of is defined by a two-step recursion:

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1. visit the root and

2. visit in preorder the subtrees of the root of from left to right.

A postorder is similarly defined as:

1. visit in postorder the subtrees of from left to right and

2. visit the root.

This Demonstration shows the preorder and postorder traversals corresponding to a randomly labeled rooted tree with a chosen number of vertices.

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Contributed by: Jaime Rangel-Mondragon (August 2011)
Open content licensed under CC BY-NC-SA

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