比较运营商C字符串 [英] Comparison operators for C strings

问题描述

我有比较C字符串的一些困难定位信息。据我所知，不像C ++，C不支持运算符重载，所以我不知道是否有什么方法可以检查一个字符串是否大于/小于另一个（例如STR1> STR2）？

I am having some difficulty locating information of comparing C strings. I understand that unlike C++, C does not support operator overloading, so I'm wondering if there is any way to check if one string is greater/less than another (e.g. str1 > str2)?

由于时间提前您的答复。这是老老实实的第一次我竟然不得不问一个问题，因为我无法找到相关的职位之一。

Thanks ahead of time for your responses. This is honestly one of the first times I have actually had to ask a question because I could not find a related post.

推荐答案

有几个，每次服不同的目的（现在省略宽字符变种）。

There are several, each serving different purposes (omitting wide character variants for now).

STRCMP - 比较两个字符串中的字符（与C概念什么字符串相等或不 - 这并不需要与人是怎么想的不谋而合 - 见的strcoll ）。有一个变种只比较第一最多的 N 的字符， STRNCMP 。

strcmp – compares two strings, character by character (with the C notion of what strings are equal or not – that doesn't need to coincide with how humans think – see strcoll). There's a variant for comparing only the first at most n characters, strncmp.

strcasecmp - 比较两个字符串，忽略大小写。有一个变种只比较第一最多的 N 的字符， strncasecmp 。

的strcoll - 比较两个字符串，观察当前设置区域（这就是为什么它被称为整理，在这种情况下，不比较）。如果你想 SS 和 SS 来比较平等的德国观众，那么这就是你应该使用什么。

strcoll – compares two strings, observing the currently set locale (which is why it's called collation, not comparing in this case). If you want ss and ß to compare equal for a German audience, then this is what you should use.

在这里您可以写

if (string1 > string2) ...

在语言，你必须写

if (strmp(string1, string2) > 0) ...

在C.基本上你两个操作数搬入函数调用，保留了比较运营商与 0 比较吧。

in C. Essentially you move both operands into the function call, retain the comparison operator and compare with 0 instead.

这篇关于比较运营商C字符串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！