lconv

Defined in header `<locale.h>`
struct lconv;

The struct lconv contains numeric and monetary formatting rules as defined by a C locale. Objects of this struct may be obtained with localeconv. The members of lconv are values of type char and of type char*. Each char* member except decimal_point may be pointing at a null character (that is, at an empty C-string). The members of type char are all non-negative numbers, any of which may be CHAR_MAX if the corresponding value is not available in the current C locale.

Member objects

Non-monetary numeric formatting parameters

char* decimal_point	the character used as the decimal point (public member object)
char* thousands_sep	the character used to separate groups of digits before the decimal point (public member object)
char* grouping	a string whose elements indicate the sizes of digit groups (public member object)

Monetary numeric formatting parameters

char* mon_decimal_point	the character used as the decimal point (public member object)
char* mon_thousands_sep	the character used to separate groups of digits before the decimal point (public member object)
char* mon_grouping	a string whose elements indicate the sizes of digit groups (public member object)
char* positive_sign	a string used to indicate non-negative monetary quantity (public member object)
char* negative_sign	a string used to indicate negative monetary quantity (public member object)

Local monetary numeric formatting parameters

char* currency_symbol	the symbol used for currency in the current C locale (public member object)
char frac_digits	the number of digits after the decimal point to display in a monetary quantity (public member object)
char p_cs_precedes	`1` if currency_symbol is placed before non-negative value, `0` if after (public member object)
char n_cs_precedes	`1` if currency_symbol is placed before negative value, `0` if after (public member object)
char p_sep_by_space	indicates the separation of `currency_symbol`, `positive_sign`, and the non-negative monetary value (public member object)
char n_sep_by_space	indicates the separation of `currency_symbol`, `negative_sign`, and the negative monetary value (public member object)
char p_sign_posn	indicates the position of `positive_sign` in a non-negative monetary value (public member object)
char n_sign_posn	indicates the position of `negative_sign` in a negative monetary value (public member object)

International monetary numeric formatting parameters

char* int_curr_symbol	the string used as international currency name in the current C locale (public member object)
char int_frac_digits	the number of digits after the decimal point to display in an international monetary quantity (public member object)
char int_p_cs_precedes (C99)	`1` if int_curr_symbol is placed before non-negative international monetary value, `0` if after (public member object)
char int_n_cs_precedes (C99)	`1` if int_curr_symbol is placed before negative international monetary value, `0` if after (public member object)
char int_p_sep_by_space (C99)	indicates the separation of `int_curr_symbol`, `positive_sign`, and the non-negative international monetary value (public member object)
char int_n_sep_by_space (C99)	indicates the separation of `int_curr_symbol`, `negative_sign`, and the negative international monetary value (public member object)
char int_p_sign_posn (C99)	indicates the position of `positive_sign` in a non-negative international monetary value (public member object)
char int_n_sign_posn (C99)	indicates the position of `negative_sign` in a negative international monetary value (public member object)

The characters of the C-strings pointed to by grouping and mon_grouping are interpreted according to their numeric values. When the terminating '\0' is encountered, the last value seen is assumed to repeat for the remainder of digits. If CHAR_MAX is encountered, no further digits are grouped. the typical grouping of three digits at a time is "\003".

The values of p_sep_by_space, n_sep_by_space, int_p_sep_by_space, int_n_sep_by_space are interpreted as follows:

0	no space separates the currency symbol and the value
1	sign sticks to the currency symbol, value is separated by a space
2	sign sticks to the value. Currency symbol is separated by a space

The values of p_sign_posn, n_sign_posn, int_p_sign_posn, int_n_sign_posn are interpreted as follows:

0	parentheses around the value and the currency symbol are used to represent the sign
1	sign before the value and the currency symbol
2	sign after the value and the currency symbol
3	sign before the currency symbol
4	sign after the currency symbol

Example

#include <locale.h>
#include <stdio.h>
 
int main(void)
{
    setlocale(LC_ALL, "ja_JP.UTF-8");
    struct lconv *lc = localeconv();
    printf("Japanese currency symbol: %s(%s)\n", lc->currency_symbol, lc->int_curr_symbol);
}

Possible output:

Japanese currency symbol: ￥(JPY )

References

C11 standard (ISO/IEC 9899:2011):

7.11/2 Localization <locale.h> (p: 223)

C99 standard (ISO/IEC 9899:1999):

7.11/2 Localization <locale.h> (p: 204)

C89/C90 standard (ISO/IEC 9899:1990):

4.4 LOCALIZATION <locale.h>