This only runs on addition, subtraction, multiplication and division! The first question asks you for the operation, then, it'll ask you to insert the numbers you'd like to have the question executed. To select your operation, type either 1, 2, 3 or 4 depending on which you'd like (the order I stated the operations in are what you type, for example, 1 is addition). This is part of a series of tests I make in my time at my school library out of free will!