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Ingy döt Net 2013-04-11 01:07:29 -07:00
parent b83f433714
commit 68f8f3e56b
14735 changed files with 178959 additions and 0 deletions
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5
Task/Stack/Racket/stack-1.rkt Normal file
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#lang racket
(define (stack) '())
(define (push x stack) (cons x stack))
(define (pop stack) (values (car stack) (cdr stack)))
(define (empty? stack) (null? stack))

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Task/Stack/Racket/stack-2.rkt Normal file
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(struct stack ([items #:auto]) #:mutable #:auto-value '())
(define (push! x stack)
(set-stack-items! stack (cons x (stack-items stack))))
(define (pop! stack)
(begin0 (car (stack-items stack))
(set-stack-items! stack (cdr (stack-items stack)))))
(define (empty? stack)
(null? (stack-items stack)))