Question

在V +中比较2个字符串是否相同的最佳方法是什么。是否有strcmp样式函数？是否可以根据字符串的lexicographical顺序获取值？

Answer 1

没有strcmp功能，你可以做两件事：

如果您想要直线bool值，可以使用==：

$in1 = "lalala"
$in2 = "lalala"

IF $in1 == $in2 THEN
    TYPE "LALALA"
END

如果你想要一个基于字典顺序返回数字的函数，你需要写一个，这样就足够了：

.PROGRAM strcmp($a, $b, result)
        AUTO len.a, len.b, pos

        len.a = LEN($a)
        len.b = LEN($b)
        pos = 1

        ; Loop to the end of the string that is the same
        WHILE (pos-1 < len.a) AND (pos-1 < len.b) AND (ASC($a,pos) == ASC($b,pos)) DO
            pos = pos+1
        END

        ; If they are still the same at the end return 0
        IF (ASC($a,pos) == ASC($b,pos)) THEN
            result = 0
            RETURN
        END

        ; If $a is -1 then we reached the end of a before b
        IF (ASC($a,pos) == -1) THEN
            result = -1
            RETURN
        END

        ; If $b is -1 then we reached the end of b before a
        IF (ASC($b,pos) == -1) THEN
            result = 1
            RETURN
        END

        ; Otherwise get the comparison of the current value of $a and $b
        result = ASC($a,pos)-ASC($b,pos)
        RETURN
.END

比较V +中的2个字符串

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