Created
August 13, 2013 07:36
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sicp 2.7
Программа Лизы неполна, поскольку она не определила, как реализуется абстракция
интервала. Вот определение конструктора интервала:
(define (make-interval a b) (cons a b))
Завершите реализацию, определив селекторы upper-bound и lower-bound.
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| (define (make-interval a b) (cons a b)) | |
| (define (upper-bound x) (car x)) | |
| (define (lower-bound x) (cdr x)) | |
| (upper-bound (make-interval 4 5)) | |
| (lower-bound (make-interval 4 5)) |
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