RealFun:  Real & Complex Math Libraries for QuickBASIC

         DEMO.TXT



         Included in this package are 4 demonstration programs, so

         that you can get a feel for how the libraries are used.  The

         sources are stored in text mode so they can be accessed with

         your favorite text processor (like 'more').  The executables

         are stand-alone; they don't need any of the QuickBASIC

         modules to run.



         DEMOATAN shows how functions in REALFUN can compute the

         inverse tangent, properly accounting for the quadrant in

         which the angle lies.  QuickBASIC's inverse tangent

         function, ATN, would give -0.7854 radians as the inverse

         tangent of -1, whereas REALFUN would give you -0.7854, or

         2.3562 radians, or -45 or 135 degrees, depending on what you

         want.



         DEMOTRIG runs through the gamut of the circular and

         hyperbolic trigonometric functions, tabulating the different

         values for different angles.



         DEMOJUL displays a Julia set fractal on a 320 x 200 x 256

         screen.  This program is slow, but is a powerful framework

         for "rolling-your-own" fractals.  To interrupt the program,

         hit any key.  The finished product is contained in

         DEMOJUL.GIF.



         DEMONEWT displays another type of fractal, that resulting

         from applying Newton's method to the equation z^4 = 1. 

         Again, this is not a quick program, but provides a framework

         for developing your own fractals.  To stop the program in

         mid-draw, hit any key.  The finished picture is NEWTON.GIF.