# LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY, LC_NUMERIC, LC_TIME

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< c‎ | locale

Defined in header `<locale.h>` |  |
#define LC_ALL /*implementation defined*/ |  |
#define LC_COLLATE /*implementation defined*/ |  |
#define LC_CTYPE /*implementation defined*/ |  |
#define LC_MONETARY /*implementation defined*/ |  |
#define LC_NUMERIC /*implementation defined*/ |  |
#define LC_TIME /*implementation defined*/ |  |

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` | selects the monetary formatting category of the C locale
`LC_NUMERIC` | selects the numeric formatting category of the C locale
`LC_TIME` | 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 <stdio.h>
    #include <locale.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: 月曜日 2017年09月25日 13時00分15秒

### References

- 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

setlocale | gets and sets the current C locale (function)

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