menu Interface

I have a small question. There is a code contains of numbers and letters. I am thinking to add a menu interface EX I want ask the user if he presses number 1 the program will ask him to entere the code, if he presses number 2 the program will ask him to enter another code, and if he presses 3 the program will close.. any hint for my idea ?

Sounds like a plan. It's surprising the number of threads you can find when you type "menu" in the search box.