racket/collects/htdp/Test/guess3.ss
2005-05-27 18:56:37 +00:00

42 lines
1.4 KiB
Scheme

; (load "tester.ss")
;; by hand, bottom
;; ------------------------------------------------------------------------
;; testing repl-list
;; teachpack: guess.ss
;; check-guess-for-list : (listof DIGIT) number -> symbol
;; to determine how guess digits and target relate to each other
(define (check-guess-for-list guess-list target)
(check-guess (convert guess-list)target))
;; check-guess : number number -> symbol
;; to determine how guess and target relate to each other
(define (check-guess guess target)
(cond
((< target guess) 'TooLarge)
((= target guess) 'Perfect)
((> target guess) 'TooSmall)))
;; convert : (listof DIGIT) -> number
;; to convert a vector of digits into a number
;; 0-th digit is right-most digit in number,
;; N-th digit is left-most digit in number
(define (convert digits)
(cond
((empty? digits) 0)
(else (+ (first digits) (* (convert (rest digits)) 10)))))
;; EXAMPLES/TESTS for convert:
(= (convert (cons 1 (cons 2 (cons 3 empty)))) 321)
(= (convert (cons 4 (cons 5 (cons 6 empty)))) 654)
;; EXAMPLES/TESTS for check-guess-for-list:
(eq? (check-guess-for-list (cons 0 (cons 0 (cons 5 empty))) 631) 'TooSmall)
(eq? (check-guess-for-list (cons 6 (cons 0 (cons 7 empty))) 631) 'TooLarge)
(eq? (check-guess-for-list (cons 1 (cons 3 (cons 6 empty))) 631) 'Perfect)
;; Test with GUI: set lib to guess-lib.ss
(guess-with-gui-list 2 check-guess-for-list)