Program:	NEWTON
Author:	Dave Gaebler
February 17, 1999

Variables used:A,B,C,X,Y,Str1
This program uses Newton's Method to approximate a real zero of Y1.  Enter Y1 WITHOUT QUOTES!
Then enter your "guess" or "seed" value, A.  The tolerance is how close to zero y-values have
to be.  If you enter 1E-4, anything with an absolute value less than 1E-4 will be considered
a zero.  The current y value is displayed at the bottom of the screen; if it's not getting 
close to zero, Newton's Method might not be a good idea, or your function might not have any
real zeros.