(11C) Quadratic Equation

[Albert Chan]

(03-22-2018 10:18 AM)Dieter Wrote:  One of my first books on RPN and HP calculators also had a program for quadratic equations.
To distinguish real and complex solutions it displayed "1111111111" for the latter case.
In the calculator display this looks like a line of "i"s that indicate a solution with an imaginary part. ;-)

I did a Quadratic Solver for Casio FX-3650P:

Instead of using a special number for signaling complex roots.
I CRASH the program, on purpose, by taking square root of negative discriminant.
(complex roots = X +/- Y * I, stored in memory X, Y)

If user is still not warned about roots being complex, I don't know what will :-)

Edit:
I had revised the solver, allowed for adjustable discriminant (if more precise available).
Since discriminant is shown, it's sign signaled real or complex roots.