[Tutor] Need to write a python and call it within a python mainprogram

[Alan Gauld]

> I need to write a function that modifies its 4 imput values,
> a,b,c,d according to the following rules.
>
> ...snipped rules ...
>
> I also need to find out how to write the main program that calls this
> function repeatedly, testing the output values for the solution to the 
> equation.

Sounds like an interesting problem.
How are you going about solving it? Are you hitting some kind of problem?
I'm not sure if you are just telling us about your project for future 
reference
or whether there is a specific question to be answered?

Alan G.