blob: f46c00af05d53b345efd6f10b1ab7b8c0454262e (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
|
(define YY (recur) (lambda (f) (lambda (a) (f ((recur recur) f) a))))
(define Y (YY YY))
(define forX (recur (low high func))
(if (low <= high)
(do
(func low)
(recur (list (+ low 1) high func)))
'()))
(define for (Y forX))
(define fibohelperX (recur (n a b))
(if (n <= 0) a
(recur (list (- n 1) b (+ a b)))))
(define fibohelper (Y fibohelperX))
(define fibo (n) (fibohelper (n 0 1)))
; Fill in the dots with the lines below...
; If you're done, try to dump the whole expression into test.hs.
; ((lambda (YY) ...) (lambda (recur) (lambda (f) (lambda (a) (f ((recur recur) f) a)))))
;
; ((lambda (Y) ...) (YY YY))
;
; ((lambda (forX) ...) (lambda (recur args) ; args: (low high func)
; (if ((car args) <= (cadr args))
; (do
; ((cadr (cdr args)) (car args))
; (recur (list (+ low 1) high func)))
; '())))
|
