Problem I { Scheme
Write Scheme programs that generate the following lists as output using only cons as the list building operator:
‘((c (e f (b))) g b)
‘((g) ((((h) i)) (a f)) d)
A list l that contains three items: the atom ’g’, the division operator ’/’, and the atom ’6’ such that ((cadr l) 18 9) evaluates to 2.
Note that cadr is composed of car and cdr such that (cadr l) = (car (cdr l)).
Problem II { Scheme
Write the following functions on lists in Scheme. The semantics of the func-tions is described through examples.
1. Get nth digit of an integer
(define getnthdigit
(lambda (m n)
...))
...
(getnthdigit 32145 1) -- 5
(getnthdigit 32145 2) -- 4
Note: You can use Scheme build-in function "modulo" and " oor".
1
(define rev (lambda (l)
...))
...
(rev ‘(e((b)(c d)(((f)))))) -- ‘(((((f)))(d c)(b))e)
Note: Do not use the Scheme build-in function "reverse".
3. Position of rst occurrence of k in list
(define positionof
(lambda (k lst)
...))
...
(positionof ‘c ‘(c b d c e f)) -- 1
Note: You may want to de ne a helper function
2
