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Bob Box
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| #lang racket | |
| (define (make-bob-box x y w h) | |
| 'bob-box (cons (cons x y) (cons w h))) | |
| (define (bob-width box) | |
| (car (cdr (box)))) | |
| (define (bob-height box) | |
| (cdr (cdr (box)))) | |
| (define b (make-bob-box 1 2 3 4)) | |
| (define (bob-area box) | |
| (* (bob-width box) (bob-height box))) | |
| (define b (make-bob-box 1 2 3 4)) | |
| (bob-area b) ;--> 12 |
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