#include <locale.h>
Remarks
Locale categories are manifest constants used by the localization routines to specify which portion of a program's locale information will be used. The locale refers to the locality (or country) for which certain aspects of your program can be customized. Locale-dependent areas include, for example, the formatting of dates or the display format for monetary values.
| Locale Category | Parts of Program Affected |
| LC_ALL | All locale-specific behavior (all categories) |
| LC_COLLATE | Behavior of strcoll and strxfrm functions |
| LC_CTYPE | Behavior of character-handling functions (except isdigit, isxdigit, mbstowcs, and mbtowc, which are unaffected) |
| LC_MAX | Same as LC_TIME |
| LC_MIN | Same as LC_ALL |
| LC_MONETARY | Monetary formatting information returned by the localeconv function |
| LC_NUMERIC | Decimal-point character for formatted output routines (for example, printf), data conversion routines, and nonmonetary formatting information returned by localeconv function |
| LC_TIME | Behavior of strftime function |
See Also localeconv, setlocale, strcoll Functions, strftime, strxfrm