How to crate a Visual Interface to a Openedge Program

I´m an Intern Developer and new to Openedge language and I´m doing some exercises that the company that I work for gave me to study the language. This is the exercise:

Develop a simple calculator that can do the 4 basic math operations. The program must contain:

• One .p file for the interface
• One .p file for the calculator logic
• One menu for choosing the wanted operation

Use the update command to get the values in the screen and the display command to show the options.
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I studied C++ and I know how to create an interface that wait for the user input and operate upon it. The problem is that in Openedge, until now, I only developed programs that ran one time with hard coded variables, how I will do this kind of thing in Openedge? Create a visual menu that waits for the user to type some input.

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