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.