I'm in a computer programming class and one of our assignments was to make a quadratic formula solver and I found that really easy. I wanted to make it more difficult and give the user the ability to change the a, b, and c in the equation. Here is my code so you can see how it's set up currently.
You want something like a text box... This is probably a bit beyond the assignment.
I would recommend using ControlP5's text box (yes, that's a library, and it will take a bit to get used to... well beyond the assignment). Alternatively, you could create your own text box... for this, you're on your own.
It is probably possible to create a more primitive input method that wouldn't stretch the bounds of this project as much... you'd need to detect keyPressed() events, for a start...
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