使用mcons,其语法与cons类似,其生成的内容需要mcar和mcdr来使用(其值中会明显标明mcons) 使用set-mcar! 和 set-mcdr!来修改mcons中的某个元素。 需要注意的是,length能够用来计算cons生成的list有多少个元素,但不能用在cons生成的cell上。并且,即使mcons生成的是list,也不能使用length Delayed Evaluation and Th...
使用mcons,其语法与cons类似,其生成的内容需要mcar和mcdr来使用(其值中会明显标明mcons) 使用set-mcar! 和 set-mcdr!来修改mcons中的某个元素。 需要注意的是,length能够用来计算cons生成的list有多少个元素,但不能用在cons生成的cell上。并且,即使mcons生成的是list,也不能使用length Delayed Evaluation and Th...
(thread-send addition-thread (list o1 o2 (current-thread)))] [(list '- o1 o2) (thread-send subtraction-thread (list o1 o2 (current-thread)))])) (for ([i (length worklist)]) (displayln (thread-receive))) 18.3 信号(Semaphores) 信号可用于帮助对任意共享资源的同步访问。当多个线程必须对...
(/ (+ lst) (length lst))) (define (avg lst) ; 不总会运行…… (/ (+ (list-ref lst 0) (list-ref lst 1) (list-ref lst 2)) (length lst))) apply函数提供了一种绕过这种限制的方法。它使用一个函数和一个list参数,并将函数应用到列表中的值: (define (avg lst) (/ (apply + lst) ...
That is, the length of the string is @racket[(length lst)], and the sequence of characters in @racket[lst] is the same sequence in the result string.@mz-examples[(list->string (list #\A #\p #\p #\l #\e))]}@defproc[(build-string [n exact-nonnegative-integer?] ...
今天在一个关注度颇高的技术公众号上看到一篇Oracle分析函数的文章，和我2009年写的博文很像，仔细看了...
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(len (lengthracket--orp/matches)) (n (minracket--orp/max-height len)) (i racket--orp/match-index)) (delete-regioneoi (point-max));delete existing (while(>n0) (insert"\n") (cond((=i racket--orp/match-index) (insert"->")) ...
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