PointersAndACalculator

The first thing to show up in the program is a calculator menu. The menu has nine options to choose from. Enter values, add, subtract, multiply, divide, average, maximum value, an option to determine whether each value entered is positive, negative or zero, and a quit option. The program presents the menu and requests for an input from the user. If the user enters an input that is not prompted in the menu then an error message will pop-up informing the user that they had entered an invalid entry. The program allows the user to try again. For a few of the options the user cannot select them without first selecting "Enter Values". If the user tries to do so without entering the values then an error message will pop up saying that they have not entered any values. The user can chose as they please until they select 'Q' for quit. After doing so they will be thanked for using the application.