LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY, LC_NUMERIC, LC_TIME
From cppreference.com
| Defined in header <locale.h>
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| #define LC_ALL /*implementation defined*/ |
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| #define LC_COLLATE /*implementation defined*/ |
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| #define LC_CTYPE /*implementation defined*/ |
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| #define LC_MONETARY /*implementation defined*/ |
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| #define LC_NUMERIC /*implementation defined*/ |
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| #define LC_TIME /*implementation defined*/ |
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Each of the above macro constants expand to integer constant expressions with distinct values that are suitable for use as the first argument of setlocale.
| Constant | Explanation |
LC_ALL
|
selects the entire C locale |
LC_COLLATE
|
selects the collation category of the C locale |
LC_CTYPE
|
selects the character classification category of the C locale |
LC_MONETARY
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selects the monetary formatting category of the C locale |
LC_NUMERIC
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selects the numeric formatting category of the C locale |
LC_TIME
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selects the time formatting category of the C locale |
Additional macro constants, with names that begin with LC_ followed by at least one uppercase letter, may be defined in locale.h. For example, the POSIX specification requires LC_MESSAGES (which controls, among other things, perror and strerror), ISO/IEC 30112:2014 (2014 draft) additionally defines LC_IDENTIFICATION, LC_XLITERATE, LC_NAME, LC_ADDRESS, LC_TELEPHONE, LC_PAPER, LC_MEASUREMENT, and LC_KEYBOARD, which are supported by the GNU C library (except for LC_XLITERATE).
Example
Run this code
#include <locale.h> #include <stdio.h> #include <time.h> #include <wchar.h> int main(void) { setlocale(LC_ALL, "en_US.UTF-8"); // the C locale will be the UTF-8 enabled English setlocale(LC_NUMERIC, "de_DE.utf8"); // decimal dot will be German setlocale(LC_TIME, "ja_JP.utf8"); // date/time formatting will be Japanese wchar_t str[100]; time_t t = time(NULL); wcsftime(str, 100, L"%A %c", localtime(&t)); wprintf(L"Number: %.2f\nDate: %Ls\n", 3.14, str); }
Possible output:
Number: 3,14 Date: 金曜日 2023年09月15日 20時04分14秒
References
- C23 standard (ISO/IEC 9899:2024):
- 7.11/3 Localization <locale.h> (p: TBD)
- C17 standard (ISO/IEC 9899:2018):
- 7.11/3 Localization <locale.h> (p: TBD)
- C11 standard (ISO/IEC 9899:2011):
- 7.11/3 Localization <locale.h> (p: 224)
- C99 standard (ISO/IEC 9899:1999):
- 7.11/3 Localization <locale.h> (p: 205)
- C89/C90 standard (ISO/IEC 9899:1990):
- 4.4 LOCALIZATION <locale.h>
See also
| gets and sets the current C locale (function) | |
| C++ documentation for locale categories
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