在C strcmp()的返回值 [英] strcmp() return values in c
问题描述
我正在学习有关的strcmp()
在C.我的理解是,当两个字符串相等, STRCMP
收益0。
I am learning about strcmp()
in C. I understand that when two strings are equal, strcmp
returns 0.
然而,当该名男子页指出, STRCMP
当第一个字符串小于第二个字符串返回的值小于0,是指长度,ASCII值,或别的东西吗?
However, when the man pages state that strcmp
returns less than 0 when the first string is less than the second string, is it referring to length, ASCII values, or something else?
推荐答案
在这个意义上说,不到的字符串表示字典(字母)顺序。
In this sense, "less than" for strings means lexicographic (alphabetical) order.
所以猫
小于狗
,因为猫
按字母顺序是狗
。
So cat
is less than dog
because cat
is alphabetically before dog
.
字典顺序,在某种意义上说,按字母顺序排列的延伸到所有ASCII(和UNI code)字符。
Lexicographic order is, in some sense, an extension of alphabetical order to all ASCII (and UNICODE) characters.
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