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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../../cpp/../c/locale/lconv.html below:

lconv - cppreference.com

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.

[edit] Member objects [edit] Non-monetary numeric formatting parameters the character used as the decimal point
(public member object) the character used to separate groups of digits before the decimal point
(public member object) a string whose elements indicate the sizes of digit groups
(public member object) [edit] Monetary numeric formatting parameters the character used as the decimal point
(public member object) the character used to separate groups of digits before the decimal point
(public member object) a string whose elements indicate the sizes of digit groups
(public member object) a string used to indicate non-negative monetary quantity
(public member object) a string used to indicate negative monetary quantity
(public member object) [edit] Local monetary numeric formatting parameters the symbol used for currency in the current C locale
(public member object) the number of digits after the decimal point to display in a monetary quantity
(public member object) 1 if currency_symbol is placed before non-negative value, ​0​ if after
(public member object) 1 if currency_symbol is placed before negative value, ​0​ if after
(public member object) indicates the separation of currency_symbol, positive_sign, and the non-negative monetary value
(public member object) indicates the separation of currency_symbol, negative_sign, and the negative monetary value
(public member object) indicates the position of positive_sign in a non-negative monetary value
(public member object) indicates the position of negative_sign in a negative monetary value
(public member object) [edit] International monetary numeric formatting parameters the string used as international currency name in the current C locale
(public member object) 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 [edit] 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: ï¿¥(JPY )
[edit] References
[edit] See also

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