The setlocale call determines the character set, error messages catalogs, monetary value formatting, numerical conventions, string collation, and alphabetic ordering.
可以调用setlocale来确定字符集、错误消息类别、货币值格式、数字转换、字符串校勘和字母排序。
If not all the requested information is retrieved, the return value is zero (0). To get extended error information, call.
如果所有要求的信息都被获取成功，返回非0值。
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