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

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Defined in header `<clocale>` |  |
#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 std::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 `<clocale>`. For example, the POSIX specification requires `LC_MESSAGES` (which controls std::perror and std::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 <cstdio>
    #include <clocale>
    #include <ctime>
    #include <cwchar>

    int main()
    {
        // the C locale will be the UTF-8 enabled English:
        std::setlocale(LC_ALL, "en_US.UTF-8");

        // decimal dot will be German:
        std::setlocale(LC_NUMERIC, "de_DE.UTF-8");

        // date/time formatting will be Japanese:
        std::setlocale(LC_TIME, "ja_JP.UTF-8");

        wchar_t str[100];
        std::time_t t = std::time(nullptr);
        std::wcsftime(str, 100, L"%A %c", std::localtime(&t));
        std::wprintf(L"Number: %.2f\nDate: %Ls\n", 3.14, str);
    }

Output:

    Number: 3,14
    Date: 日曜日 2022年11月06日 17時55分10秒

### See also

setlocale | gets and sets the current C locale (function)
locale | set of polymorphic facets that encapsulate cultural differences (class)

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