Getting user's choices from a menu

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I'd appreciate some ideas about user-friendly and fool-proof ways of doing
this:
1    present the user with a menu of choices (not mutually exclusive):
eg   MENU OF USER CHOICES
     A   this
     B   that
     C   other

2    get user's choice(s):
eg   ENTER THE LETTER (A,B,C) OF YOUR CHOICE(S):

3    suppose the choices are A and C. Is it preferable to read them as a
"unit", or as separate items? Should I insist on spaces between choices? If
so, what happens if the user enters AC instead of A C? What if the menu
choices were numerals (1,2,3) instead of letters? Would the code differ?
Would there be any different issues to take into account?

Thank you

Alex Caracatsanis

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