如何找到CLIPS中具有最大值的变量ID？
如何找到CLIPS中具有最大值的变量ID？
提问于 2018-06-02 07:41:15
我试着根据他们的考试成绩找出最好的学生。我从用户那里拿来的。我想让剪辑给我最好的学生的ID。例如，student1分数70、student2分数80和学生3分数100。剪辑应该告诉我“最好的学生是...因为他/她的重点是...”我使用了全局变量，但我不确定它是否正确，因为它不起作用。
(defglobal ?*student1mark* = 0)
(defglobal ?*student2mark* = 0)
(defglobal ?*student3mark* = 0)
(defrule get-marks
=>
(printout t "What is the exam mark of student1?" crlf)
(bind ?*student1mark* (read))
(assert (stu1mark ?*student1mark*))
(printout t "What is the exam mark of student2?" crlf)
(bind ?*student2mark* (read))
(assert (stu2mark ?*student2mark*))
(printout t "What is the exam mark of student3?" crlf)
(bind ?*student3mark* (read))
(assert (stu3mark ?*student3mark*))
(build (str-cat
"(deffacts students (student student1 " ?*student1mark* " student student2 " ?*student2mark* " student student3 " ?*student3mark* "))")))
(defrule whichstudent
(student ?ID = (max ?*student1mark*" ?*student2mark*" ?*student3mark*))
=>
(printout t "The best student is " ?ID crlf))回答 1
Stack Overflow用户
回答已采纳
发布于 2018-06-02 09:43:48
我不会使用全局变量。我会选择一个模板和事实。在规则的帮助下，一个解决方案是：
CLIPS (6.30 3/17/15)
CLIPS> (deftemplate student
(slot id (type INTEGER) (default ?NONE))
(slot mark (type INTEGER) (default ?NONE))
)
CLIPS> (deffacts students
(student (id 1) (mark 80))
(student (id 2) (mark 79))
(student (id 4) (mark 60))
(student (id 3) (mark 90))
)
CLIPS> (defrule best-mark
(compare-students)
(student (id ?id) (mark ?mark))
(not
(student (id ?) (mark ?nmark&:(> ?nmark ?mark)))
)
=>
(printout t "The best student is student no. " ?id crlf)
)
CLIPS> (reset)
CLIPS> (assert (compare-students))
<Fact-5>
CLIPS> (run)
The best student is student no. 3关键部分是
(student (id ?id) (mark ?mark))
(not
(student (id ?) (mark ?nmark&:(> ?nmark ?mark)))
)因此，如果没有其他得分更高的学生，则此规则与学生事实相匹配。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/50652184
复制相关文章
相似问题