What's the simplest code that will let me get character input

Let's say I have a menu with choices a, b, c. I want the user to make selections without having to press enter. They just press one key and the program takes care of the rest. What's the simplest way to do this?

Encephalopathic wrote:
with a console application: there is no simple way that I know of.This is an issue I have explored before, and there definitely is no easy way to do this, or any that I know of, for that matter. The only thing I know how to do in this context is recognize when the enter key has been pressed with no input.

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