Question

I want

(member? 'a '((d d) (d d)))

to return false

what am I doing wrong

(define (member? x list)
 (cond
  ((null? list) #t )
   (else ( or (or (eq? (car (car list)) x) (eq? (cdr (car list)) x)) (member? x (cdr list) ))  
)))

If someone can tell me what is wrong with my member function I would greatly appreciate it.

Answer 1

((null? list) #t )

You’re returning true if the list is empty. That’s wrong.