为什么STRCMP（）返回0时，其输入是平等的吗？ [英] Why does strcmp() return 0 when its inputs are equal?

问题描述

当我做给C字符串调用比较函数是这样的：

When I make a call to the C string compare function like this:

的strcmp（时间，时间）

它返回0，这意味着该字符串不相等。

It returns 0, which implies that the strings are not equal.

谁能告诉我，为什么C实现似乎做到这一点？我想，如果等于它会返回一个非零值。我很好奇，我看到这种行为的原因。

Can anyone tell me why C implementations seem to do this? I would think it would return a non-zero value if equal. I am curious to the reasons I am seeing this behavior.

推荐答案

STRCMP返回一个词汇差异（或者我应该称之为短路串行字节比较？:-)）两个字符串你给作为参数。
0意味着两个字符串相等

strcmp returns a lexical difference (or should i call it "short-circuit serial byte comparator" ? :-) ) of the two strings you have given as parameters. 0 means that both strings are equal

一个正值意味着S1将是一本字典S2之后。

A positive value means that s1 would be after s2 in a dictionary.

一个负值意味着S1将是一本字典S2之前。

A negative value means that s1 would be before s2 in a dictionary.

比较时间和金钱，这是明显的不同，即使一个人会说，当你因此非零值，时间就是金钱！ ： - ）

Hence your non-zero value when comparing "time" and "money" which are obviously different, even though one would say that time is money ! :-)

这篇关于为什么STRCMP（）返回0时，其输入是平等的吗？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！