Write a LISP function COUNTX which takes an atom and a list and returns the number...

Write a LISP function COUNTX which takes an atom and a list and returns the number of top-level occurrences of the atom in the list. For example: (COUNTX ‘A ‘(A (A B) B A B A (B A)) Returns the value 3, the other two A’s are not at the top level

Expert Solution

Answer

(defun COUNTX (a lst) ;function COUNTX that takes an atom and a list

(cond

((null lst) 0) ;return 0 when list is empty

((equal a (car lst)) ;if given atom is the head of the list

(+ 1 (COUNTX a (cdr lst)))) ;add 1 to the value returned by the recursive call of COUNTX

(t (COUNTX a (cdr lst))))) ;else, call COUNTX with the rest of the given list

Output

Note - Please let me know if you have any query.

venereology answered 1 month ago

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