How do I make a program remember what number it created laast time?

I'm making a program where I use a function to solve a quadratic, and if the value of a is not zero, it checks if it it has real roots and I have to remember those numbers.

The form is ax^2 + bx + c

Later on in the program, I have to make it so that if I call the program and it has never been called before with an a value which was not 0, then it'll return some value.
I don't know how to make it remember numbers or make it know if it's never been called before. I know something to do with static numbers.

> "Later on in the program, I have to make it so that if I call the program.."
^What does this line mean ? ...are you confusing 'function' with program ?
If yes... you're on the right track... just declare a static variable inside the function to remember the 'state' data.