To sort out atoms first and then sublists from a list in LISP

Question

I have this homework in LISP where I need to sort out atoms and then sublists from a list. I\'m sure this is supposed to be easy task but as I\'m not much of a programmer th

Answer 1

You can do this recursive way:

(defun f (lst) 
    (cond 
        ((null lst) nil)
        ((atom (car lst)) 
        (append (list (car lst)) (f (cdr lst)))) 
        (T
            (append (f (cdr lst)) (list (f (car lst))))
        )
    )
)
(step (f '(5 -1 (2 6 1) (8 7 -3) (0 (9 4)) -6)))

Output:

step 1 --> (F '(5 -1 (2 6 1) (8 7 -3) ...))                                                                   
step 1 ==> value: (5 -1 -6 (0 (9 4)) (8 7 -3) (2 6 1))