If/Then to accept multiple possiblilities

When creating an if/then senario in lisp's, how do you do consider the expression true for more than one value.

Example, I need to ask the user what viewport they want to change, Top, Front, or Right... But I want it to accept "Top" or "T" for Top.

Does this work?:

(setq vpn (if (= vp (or "Top" "T") (2))

Would "T" or "Top" set vpn as 2?

Also, is there a way for me to test on my own?

Try this with T and Top (also F, Front, R, Right)

(initget 1 "Top Front Right")
(setq ans (getkword "Top, Front or Right"))
(cond
 ((= ans "Top") (setq vpn 2))
 ((= ans "Front") (setq vpn 3))
 ((= ans "Right") (setq vpn 4))
 )

Look at these 2 functions

(initget "Abc Def _Ghi Jkl")(getkword "\nEnter an option (Abc/Def): ")Entering A returns Ghi and entering _J returns Jkl.

I got the initget/getkword functions to work for me in this case, but now would I do a if/then that would allow multiple correct inputs, example:

if x=(top or bottom), then do a function, else exit program

I got the initget/getkword functions to work for me in this case, but now would I do a if/then that would allow multiple correct inputs, example:

 

if x=(top or bottom), then do a function, else exit program

You could use either the or function, or maybe the member function

lol, I now this is going to sound funny, but I need help on using Visual Lisp's help...

I searched for the "or" function and under the concept tab is says:

"$(or, val1 [, val2,…, val9])"

And I have a couple questions.

What's the "$" mean?

Why is ",val1,...,val9" in "[]" signs?

$

[var1,var2]