For a quadratic, computes its roots
(real or [conjugate] complex) and plots the parabola as well as its
"mirror" parabola.
Is there a simple way to "see" the complex roots
from the real roots of the other parabola ?
Computation structure — A PHP file
(this page: 'Fx-parabolamir.php') calls
(via 'action=') an intermediate PHP file ('Parabolamir.php'), which
(through $_POST and 'shell_exec') sends the problem data
as command line arguments to a Fortran 90 executable (exe).
This last does the computing (exe all‑the‑data),
and makes 'system' call(s) to 'gnuplot'
and 'base64', for the final (temporary) webpage.
Keywords: PHP, command line arguments,
Fortran executable, gnuplot. (No intermediate data file.)
Draws a graph of the parabolas.
This is essentially a template.
Alternatively, try: c = 5. | 
