Scheme 方案匹配程序中的错误
当运行下面的代码时,我在结果中的某些地方不断重复Scheme 方案匹配程序中的错误,scheme,racket,Scheme,Racket,当运行下面的代码时,我在结果中的某些地方不断重复#,我不知道为什么 测试:运行(男女配对) 代码如下: ;;球拍兼容性 (define (write-line x) (display x) (newline)) (define (append! a b) (if (null? (cdr a)) (set-cdr! a b) (append! (cdr a) b))) );这将开始配对计划,并接受 ; 初始投标人和被投标人,重置其状态和 ; 把他们送到求爱
#
,我不知道为什么
测试:运行(男女配对)
代码如下:
;;球拍兼容性
(define (write-line x)
(display x)
(newline))
(define (append! a b)
(if (null? (cdr a))
(set-cdr! a b)
(append! (cdr a) b)))
);这将开始配对计划,并接受
; 初始投标人和被投标人,重置其状态和
; 把他们送到求爱程序中
; 提案将开始
(define (match-make proposers proposees)
(send proposers 'reset)
(send proposees 'reset)
(courtship proposers proposers)
(zip-together (send proposers 'name)
(send (send proposers 'intended) 'name)))
);每一个无资格的投标人提出建议,直到没有
; 更多无担保提案人
(define (courtship unengaged-proposers proposers)
(if (null? unengaged-proposers)
(display "match-make complete")
(begin ((car unengaged-proposers) 'propose)
(courtship (currently-unengaged unengaged-proposers) proposers))))
);获取当前未授权的人员
(define (currently-unengaged list-of-people)
(filter unengaged list-of-people))
);检查一个人是否未受限制
(define (unengaged person)
(if (null? (person 'intended))
#t
#f))
);向每个人发送给定的消息
; 在给定的人员列表中
(define (send list-of-people message)
(if (null? list-of-people)
'()
(begin ((car list-of-people) message)
(send (cdr list-of-people) message))))
);检查给定的两个人
; 你是一对吗
(define (couple? person1 person2)
(if ((eq? (person1 'intended) person2) #t)
#t
#f))
);合并两个给定列表
(define (zip-together list1 list2)
(if (null? list1)
'()
(cons (list (car list1) (car list2))
(zip-together (cdr list1) (cdr list2)))))
);组合每个为真的元素
; 对于给定谓词
(define (filter pred lst)
(cond ((null? lst) '())
((pred (car lst)) (cons (car lst) (filter pred (cdr lst))))
(else (filter pred (cdr lst)))))
);获取两个列表(列表1)和另一个列表
; 任意长度的列表(列表2)和返回值
; 列表1中的两个中的任何一个先出现
; 在清单2中
(define (preference list1 list2)
(write (list list1 list2))
(cond ((eq? (car list1) (car list2)) (car list1))
((eq? (cadr list1) (car list2)) (cadr list1))
(else (preference list1 (cdr list2)))))
);创建具有特定状态的人
; 以及某些可以调用的消息
; 在那个人身上。我标记了那些人在哪里
; 为问题1和问题2添加的是
; 任何显示和换行的地方
(define (make-person my-name)
(let ((preference-list '())
(possible-mates '())
(current-intended '()))
(define (i-like-more person1 person2) ;Problem 1
(preference (list person1 person2) preference-list)
(cond ((eq? (car (me 'loves)) person1) #t)
((eq? (car (me 'loves)) person2) #f)
(else (preference (list person1 person2) (cdr preference-list)))))
(define (me message)
(cond ((eq? message 'name) my-name)
((eq? message 'intended) current-intended)
((eq? message 'loves) preference-list)
((eq? message 'possible) possible-mates)
((eq? message 'reset)
(set! current-intended '())
(set! possible-mates preference-list)
'reset-done)
((eq? message 'load-preferences)
(lambda (plist)
(set! preference-list plist)
(set! possible-mates plist)
(set! current-intended '())
'preferences-loaded))
((eq? message 'propose)
(let ((beloved (car possible-mates)))
(begin
(set! possible-mates (cdr possible-mates))
(begin
(display (me 'name))
(display " proposed to ")
(display (beloved 'name))
(newline))
(if (eq? ((beloved 'i-love-you) me)
'i-love-you-too)
(begin
(display (me 'name))
(display " and ")
(display (beloved 'name))
(display " are engaged ")
(newline)
(set! current-intended beloved)
'we-are-engaged)
(begin
(display "no one loves me")
'no-one-loves-me)))))
((eq? message 'i-love-you) ;Problem 1
(lambda (proposer)
(cond
((null? (me 'intended))
(begin
(set! current-intended proposer)
(display (me 'intended))
(display " says i love you too")
(newline)
'i-love-you-too))
((i-like-more proposer (me 'intended))
(begin
(set! current-intended proposer)
(display (me 'intended))
(display " dumped ")
(display (me 'intended))
(newline)
(((me 'intended) 'i-changed-my-mind) me)
'i-love-you-too))
(else (begin
(display (me 'intended))
(display " rejected ")
(display (me 'name))
'buzz-off-creep)))))
((eq? message 'i-changed-my-mind)
(lambda (lost-love)
(cond ((eq? current-intended lost-love)
(set! current-intended '())
'dumped!)
(else
'there-must-be-some-misunderstanding))))
(else
(display "Bad message to a person")
(newline)
(list my-name message))))
me))
;;这是一个测试文件
(define alan (make-person 'Alan))
(define bob (make-person 'Bob))
(define charles (make-person 'Chuck))
(define david (make-person 'Dave))
(define ernest (make-person 'Ernie))
(define franklin (make-person 'Frank))
(define agnes (make-person 'Agnes))
(define bertha (make-person 'Bertha))
(define carol (make-person 'Carol))
(define deborah (make-person 'Debbie))
(define ellen (make-person 'Ellen))
(define francine (make-person 'Fran))
((alan 'load-preferences)
(list agnes carol francine bertha deborah ellen))
((bob 'load-preferences)
(list carol francine bertha deborah agnes ellen))
((charles 'load-preferences)
(list agnes francine carol deborah bertha ellen))
((david 'load-preferences)
(list francine ellen deborah agnes carol bertha))
((ernest 'load-preferences)
(list ellen carol francine agnes deborah bertha))
((franklin 'load-preferences)
(list ellen carol francine bertha agnes deborah))
((agnes 'load-preferences)
(list charles alan bob david ernest franklin))
((bertha 'load-preferences)
(list charles alan bob david ernest franklin))
((carol 'load-preferences)
(list franklin charles bob alan ernest david))
((deborah 'load-preferences)
(list bob alan charles franklin david ernest))
((ellen 'load-preferences)
(list franklin charles bob alan ernest david))
((francine 'load-preferences)
(list alan bob charles david franklin ernest))
(define men (list alan bob charles david ernest franklin))
(define women (list agnes bertha carol deborah ellen francine))
这个问题将受益于关于代码打算如何使用的一些信息,以及关于处理到person对象的消息的函数的目的和用法的一些评论 但是,问题似乎是程序运行时显示的是
#
,而不是一些预期的字符串
显示的是返回而不是调用的函数。这有几个原因:
首选项
定义为写入
其第一个参数,即person对象列表(write(me)name)
或(write((me)designed)name)
时,使用(write(me)designed))
i-like-more
,它调用首选项
,应该定义为
(define (i-like-more person1 person2)
(eq? person1 (preference (list person1 person2) preference-list)))
这里的问题需要进一步澄清。不清楚发问者遇到了什么问题。等等,问题是什么?请进一步澄清……在问题被改写为可回答之前,先对问题进行否决。不幸的是,目前还没有。