Exercise 2.22: Louis Reasoner tries to rewrite
the first square-list procedure of Exercise 2.21 so that it
evolves an iterative process:


(define (square-list items)
  (define (iter things answer)
    (if (null? things)
        answer
        (iter (cdr things)
              (cons (square (car things))
                    answer))))
  (iter items nil))

Unfortunately, defining square-list this way produces the answer list in
the reverse order of the one desired.  Why?

Louis then tries to fix his bug by interchanging the arguments to cons:


(define (square-list items)
  (define (iter things answer)
    (if (null? things)
        answer
        (iter (cdr things)
              (cons answer
                    (square 
                     (car things))))))
  (iter items nil))

This doesn’t work either.  Explain.