how do i make it so that if someone hits N they exit the program?

wait n/m

Are you talking about console or Win32 applications?
I assume console, and I must admit I don''t know.
In Windows environment, there''s a thing called WM_KEYDOWN and you''d have to check the key scan code for ''N''...

char letter = getchar();
if (letter == "n"
Exit();