Extra Homework

(for Iosif B.)

Section 5.5 of text gives the applet code
for drawing a random binary tree.  
It defaults the number of external nodes
to 16.  Extend the interface to read in
a user-input number to be used in place of "16".
Also, you may need to re-do some of the computations
for drawing the tree, including changing the window
sizes.