first give the 2 numbers you want to (+) (-) (x) or (/) to the calculator; the order doesn't matter for (+) and (x) but it does matter for (/) and (-), then press (+) (-) (x) or (/) depending on what you want to do to the numbers you gave.
I was thinking of making a project and I had the idea of making a calculator, please give feedback on how it is. Tell me if something isn't working. Thanks a million!