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#### 概述
语言环境管理
locale指语言环境
#### 相关函数
```c
/*
* 设置或检索locale
* category：要修改的locale的种类
* LC_CTYPE:字符的类别
* locale：locale的值
* “C”或“POSIX”代表可移植的locale，所有的合规系统中都应有它们
*/
char *setlocale(int category, const char *locale);
```