CLIPS

Question

代码向用户提出 y/n 问题并进行更改 - 很简单。该语句似乎只接受整数和浮点类型，我只需要两个答案，所以我使用 1 和 0，并排除其余部分，但它只读取数字，所以只排除数字，不排除字符。

(defrule rule01
    =>
    (printout t "Question (yes=1/no=0)?" crlf)
    (bind ?x (read))
    (if (!= ?x 1)
        then
        (if (= ?x 0)
            then
            (assert (rule01 no))
        else (printout t "Use ONLY 0 OR 1 for your answers!" crlf))
    else (assert (rule01 yes))))

目前，当您尝试输入一个字符时，它 returns 如下：

CLIPS> (run)
Question (yes=1/no=0)?
g
[ARGACCES5] Function <> expected argument #1 to be of type integer or float
[PRCCODE4] Execution halted during the actions of defrule rule01.

如何为字符设置例外？

Answer 1

使用 eq 和 neq 代替 = 和 <>。

         CLIPS (6.31 6/12/19)
CLIPS> 
(defrule rule01
    =>
    (printout t "Question (yes=1/no=0)?" crlf)
    (bind ?x (read))
    (if (neq ?x 1)
        then
        (if (eq ?x 0)
            then
            (assert (rule01 no))
        else (printout t "Use ONLY 0 OR 1 for your answers!" crlf))
    else (assert (rule01 yes))))
CLIPS> (reset)
CLIPS> (run)
Question (yes=1/no=0)?
g
Use ONLY 0 OR 1 for your answers!
CLIPS>

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