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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../locale/LC_categories.html below:

LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY, LC_NUMERIC, LC_TIME

#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).

[edit] Example

Output:

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

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