IF and Then functions in Autolisp

I'm kind of new to the whole lisp language, and not even sure if this will be possible, but i think it should be.
Here's what I'm doing:
I have 2 parts to the lisp, and a need a function in there that would go and check one of the variables, if it finds a certain value it will go to part 1 of the lisp, if it finds a different value it will go to the other part. I tried messing with IF function but either i'm not doing it right or it's not the solution i'm looking for
Thanks for any help.

Viktor.

 

Viktor,
You're on the right track

(if (= val value) (do-part-one)(do-part-two))

where (defun do-part-one....) and (defun do-part-two ....) are
two functions

or
(if (= val value)
(progn
.........steps you want in the first case
)
(progn
.........steps to do if val <> value
)
)

value it will go to part 1 of the lisp, if it finds a different value it will go to the other part. I tried messing with IF function
but either i'm not doing it right or it's not the solution i'm looking for

 

Or use the cond function

[cond](cond
((= val value)
(do-part-one)
)
(T ; always executed if part one is false
(do-part-two))
)

)[/cond]

This one will give you more choices of action,
The cond will execute the first True condition and skip the rest
of the test.

[cond](cond
((= val value)
(do-part-one)
)
((= val value2)
(do-part-two))
)
(T ; skip if part 1 or 2 is true
(do-this-if-failed) ; part 1 & 2 failed
)
)[/cond]

 

Thanks for both replies, i tried them and both worked, although i find the COND function suit me better.
Thanks again,
Viktor