# std::lconv

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< cpp‎ | locale

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 )

### See also

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)

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