This program automatically calculates the volume of a 
revolution with disk-washer method-- with graph.



This program automatically calculates the volume of a 
revolution with disk-washer method.  It will take in 
perimeters, figures the drawing window, draws the region, 
shows the revolutin by drawing several cross-section disks 
and then computes the volume.

You need to put the two functions at y1 and y2 before start 
this program, at least y2 has to be 0.

The author Dr. Zhanbo Yang, invites comments about 
programming of these programs, and their use in classrooms.  
He can be reached at zyang@shawnee.edu.  The author reserves
all other right.