Group Work
===============

Do individually first and then collaborate as a group:

* Review the tree terminology in the notes by identifying examples for the graph given on the board.  


Do as a group:

* Write a recursive function that takes a file or directory and prints out the filenames and directories for the entire directory tree.

* Discuss how you would implement an iterative function that takes a file or directory and prints out the filenames and directories for the entire directory tree.

* Which version do you prefer and why?



PRE-ORDER AND POST ORDER TRAVERSAL of Tree on board