Category Functionality
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LC_COLLATE Adapts strcoll, strxfrm, wcscoll, and wcsxfrm to the
language/culture of the locale.
LC_CTYPE Adapts the isxxx/iswxxx functions in ctype.h to the
character set associated with the locale, and affects
multibyte/wide character mapping.
LC_MONETARY Sets parameters pertaining to the display of monetary
values such as decimal point, grouping (e.g., thousands),
group separator, etc. This category is purely advisory and
affects no standard library functions.
LC_NUMERIC Like LC_MONETARY, but for non-monetary values (e.g., the
decimal point may be different than for non-monetary
values).
LC_TIME Adapts strftime and wcsftime to cultural specifications.