Programmed in BASIC by: I. C. Jong, 1990
          Converted into JAVA by: M. G. McMullen, 2006 

                    D I R E C T I O N S:
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   To find a root of any equation defined by Y(X) = 0,
   do the following: 

	(a) Define the equation and values in the boxes;
		  (i) define Y = Y(X) in the equation box; 
		 (ii) define XI, the initial X value in the 
		      XI box; 
		(iii) define DX, the increment for X, in the
		      DX box; 
		 (iv) define XF, the final X value, in the 
		      XF box.
	(b) Run the program to explore the locations of 
	    the roots by making trial runs until the graph 
	    crosses the X axis.
	(c) Read the two neighboring digital values of X 
	    which bound the root at the crossing of the 
	    graph over the X axis.
	(d) Use a smaller increment (e.g., one-tenth of the 
	    preceding increment) to plot between those two 
	    values of X.
	(e) Repeat steps (c) and (d) until the root is 
	    determined to as many digits of precision as 
	    desired or permitted.
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