Capture characters from standard input without waiting for enter to be pressed

I can never remember how I do this because it comes up so infrequently for me. But in C or C++, what is the best way to read a character from standard input without waiting for a newline (press enter). Also ideally it wouldn't echo the input character to the screen. I just want to capture keystrokes with out effecting the console screen.
@adam - Can you clarify : Do you want to a function that will return immediately if no character is available, or one that will always wait for a single keystroke?

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