Question

In scheme coding language Write a function filterN that returns only the numbers n through m from a lat. For example: (filterN 4 6 (1 turkey 5 9 4 bacon 6 cheese))

returns (5 4 6). Use only functions add1, sub1, and, or, <, >, null?, number?, zero?, define, lambda, cond, and else in the code. Assume n < m

Answer 1

car and cdr had to be used to access the list elements.

Code:

(define filterN

(lambda (n m li)

(cond ((null? li) '())

((and (and (number? (car li)) (>= (car li) n)) (<= (car li) m)) (cons (car li) (filterN n m (cdr li))))

(else (filterN n m (cdr li))))))

(filterN 4 6 '(1 turkey 5 9 4 bacon 6 cheese))

Attaching a screenshot of code: