(Solved Homework): Specifically, how do you read this code? I'm familiar with what CAR and CDR do, but I don't know how to read the conditional statement…

Specifically, how do you read this code? I’m familiar with what CAR and CDR do, but I don’t know how to read the conditional statement

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5. Let F be the following LISP function (DEFUN F (L) COND (NULL L) NIL) (NULL (CDR L)) (CAR L) ) T (F (CDR L))) The NULL function returns a true value if its argument is an empty list (a) What does F return when passed (A B) as its argument? (b) What does F return when passed (A (B C)) as its argument? (c) What does F return when passed (A B (C)) as its argument? (d) In general, what does F return when passed a list L?

Expert Answer

The basic syntax of COND is:

(cond

((predicate1) (then do something 1)) ;if this predicate is true,
;do something 1
((predicate2) (then do something 2)) ;if this predicate is true,
;do something2,
;each predicate and action
;following the
;first one is optional

(t (else do this)) ;else, if none of the
;predicates returns
;T, do this
)

here predicate1 is NULL L then NIL

and predicate2 is NULL (CDR L) then CAR L

and the else case is F (CDR L)

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