locale.h

lconv

Indicates format information about a number.

LC_CTYPE   0

Language symbol type, which affects character classification and case conversion.

LC_NUMERIC   1

Number type, which affects the number format.

LC_TIME   2

Time type, which affects date and time formats.

LC_COLLATE   3

Character sorting type, which affects string comparison and sorting habits.

LC_MONETARY   4

Monetary type, which affects monetary information.

LC_MESSAGES   5

Message type, which affects prompt information, error information, status information, titles, labels, buttons, and menus.

LC_ALL   6

All types, which affect all content of locale settings. If LC_ALL is set, the locale information of all types is set to be consistent with LC_ALL.

setlocale (int category, const char *locale)

char * 

Sets the current locale information based on input parameters.

localeconv (void)

struct lconv * 

Obtains the locale information about a region and stores them in lconv.