std::lconv

Defined in header `<clocale>`
struct lconv;

The class std::lconv contains numeric and monetary formatting rules as defined by a C locale. Objects of this struct may be obtained with std::localeconv. The members of std::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 (C++11)	1 if int_curr_symbol is placed before non-negative international monetary value, 0 if after (public member object)
char int_n_cs_precedes (C++11)	1 if int_curr_symboll is placed before negative international monetary value, 0 if after (public member object)
char int_p_sep_by_space (C++11)	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 (C++11)	indicates the separation of `int_curr_symbol`, `negative_sign`, and the negative international monetary value (public member object)
char int_p_sign_posn (C++11)	indicates the position of `positive_sign` in a non-negative international monetary value (public member object)
char int_n_sign_posn (C++11)	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

Run this code

#include <clocale>
#include <iostream>
 
int main()
{
    std::setlocale(LC_ALL, "ja_JP.UTF-8");
    std::lconv* lc = std::localeconv();
    std::cout << "Japanese currency symbol: " << lc->currency_symbol
              << '(' << lc->int_curr_symbol << ")\n";
}

Output:

Japanese currency symbol: ￥(JPY )

Language
Standard Library Headers
Freestanding and hosted implementations
Named requirements
Language support library
Concepts library (C++20)
Diagnostics library
Utilities library
Strings library
Containers library
Iterators library
Ranges library (C++20)
Algorithms library
Numerics library
Input/output library
Localizations library
Regular expressions library (C++11)
Atomic operations library (C++11)
Thread support library (C++11)
Filesystem library (C++17)
Technical Specifications

localeconv	queries numeric and monetary formatting details of the current locale (function)
numpunct	defines numeric punctuation rules (class template)
moneypunct	defines monetary formatting parameters used by std::money_get and std::money_put (class template)