单个 IF 中的多个 OR 运算符

Question

如何在单个 if 语句中使用多个 OR 运算符？我试过这种方式，但出现错误：

Incompatible data types in expression or assignment.

我查看了长度函数的文档，它是 LENGTH ( {string | raw-expression | blob-field } [ , type ] )?

代码如下：

DEFINE VARIABLE cMonth AS CHARACTER.
DEFINE VARIABLE cDay AS CHARACTER.
DEFINE VARIABLE cYear AS CHARACTER.

UPDATE cDateFromUser.

cDay = (SUBSTRING(cDateFromUser,1,2)).
cMonth = (SUBSTRING(cDateFromUser,3,2)).
cYear = (SUBSTRING(cDateFromUser,5,4)).

IF (LENGTH(cDay <> 2)) OR (LENGTH(cMonth <> 2)) OR (LENGTH(cYear <> 4)) THEN DO:
    /*Code*/
END.
ELSE DO:
    /*Code*/
END.

Answer 1

这里的语法不正确。使用以下 IF:

IF (LENGTH(cDay) <> 2) OR (LENGTH(cMonth) <> 2) OR (LENGTH(cYear) <> 4) THEN DO:

单个 IF 中的多个 OR 运算符

Multiple OR operators in a single IF

progress-4gl

openedge