CODEWITHSUNDEEP
lisp
obsolutemal
obsolutemal

Reputation: 65

Is my lisp evaluation correct?

I know my answer is dead wrong, I would like to know how I would be able to reach the answer. What did I do wrong?

X = (setf X '(88 ((11 21 31 41)) (90 91 92 93)))

I have to write LISP expression which evaluates to the list:

(11 (11 21 31 41) (88 90 91 92 93))

My Answer: 

(list (caadr X) (cdddr X))

Upvotes: 1

Views: 55

Answers (1)

molbdnilo
molbdnilo

Reputation: 66371

These should get you going:

CL-USER> (cadr X)
((11 21 31 41))
CL-USER> (caadr X)
(11 21 31 41)
CL-USER> (caaadr X)
11
CL-USER> (cons (caaadr X) (cadr X))
(11 (11 21 31 41))
CL-USER> (caddr X)
(90 91 92 93)
CL-USER> (car X)
88
CL-USER> (cons (car X) (caddr X))
(88 90 91 92 93)

(Experimenting in the REPL is a very effective way of finding things out.)

Upvotes: 1

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