The locale header is useful for setting location specific information.
Variables:
struct lconv
Macros:
NULL
LC_ALL
LC_COLLATE
LC_CTYPE
LC_MONETARY
LC_NUMERIC
LC_TIME
Functions:
localeconv();
setlocale();
The lconv
structure contains the following variables in any
order. The use of this structure is described in 2.6.3 localeconv.
char *decimal_point;
char *thousands_sep;
char *grouping;
char *int_curr_symbol;
char *currency_symbol;
char *mon_decimal_point;
char *mon_thousands_sep;
char *mon_grouping;
char *positive_sign;
char *negative_sign;
char int_frac_digits;
char frac_digits;
char p_cs_precedes;
char p_sep_by_space;
char n_cs_precedes;
char n_sep_by_space;
char p_sign_posn;
char n_sign_posn;
The LC_
macros are described in 2.6.2 setlocale.
NULL
is the value of a null pointer constant.
Declaration:
char *setlocale(int
category, const char *
locale);
Sets or reads location dependent information.
category can be one of the following:
LC_ALL |
Set everything. |
LC_COLLATE |
Affects strcoll and strxfrm functions. |
LC_CTYPE |
Affects all character functions. |
LC_MONETARY |
Affects the monetary information provided by localeconv function. |
LC_NUMERIC |
Affects decimal-point formatting and the information provided by
localeconv function. |
LC_TIME |
Affects the strftime function. |
A value of "C" for locale sets the locale to the normal C translation environment settings (default). A null value ("") sets the native environment settings. A null pointer (NULL) causes setlocale to return a pointer to the string associated with this category for the current settings (no changes occur). All other values are implementation-specific.
After a successful set, setlocale
returns a pointer to a
string which represents the previous location setting. On failure it returns
NULL.
Example:
#include<locale.h> #include<stdio.h> int main(void) { char *old_locale; old_locale=setlocale(LC_ALL,"C"); printf("The preivous setting was %s.\n",old_locale); return 0; }
Declaration:
struct lconv *localeconv(void);
Sets the structure lconv
to represent the current location
settings.
The string pointers in the structure may point to a null string ("") which
indicates that the value is not available. The char types are nonnegative
numbers. If the value is CHAR_MAX
, then the value is not
available.
lconv
variables:
char *decimal_point |
Decimal point character used for non-monetary values. |
char *thousands_sep |
Thousands place separator character used for non-monetary values. |
char *grouping |
A string that indicates the size of each group of digits in non-monetary quantities. Each character represents an integer value which designates the number of digits in the current group. A value of 0 means that the previous value is to be used for the rest of the groups. |
char *int_curr_symbol |
A string of the international currency symbols used. The first three characters are those specified by ISO 4217:1987 and the fourth is the character which separates the currency symbol from the monetary quantity. |
char *currency_symbol |
The local symbol used for currency. |
char *mon_decimal_point |
The decimal point character used for monetary values. |
char *mon_thousands_sep |
The thousands place grouping character used for monetary values. |
char *mon_grouping |
A string whose elements define the size of the grouping of digits in monetary values. Each character represents an integer value which designates the number of digits in the current group. A value of 0 means that the previous value is to be used for the rest of the groups. |
char *positive_sign |
The character used for positive monetary values. |
char *negative_sign |
The character used for negative monetary values. |
char int_frac_digits |
Number of digits to show after the decimal point in international monetary values. |
char frac_digits |
Number of digits to show after the decimal point in monetary values. |
char p_cs_precedes |
If equal to 1, then the currency_symbol appears before a
positive monetary value. If equal to 0, then the
currency_symbol appears after a positive monetary
value. |
char p_sep_by_space |
If equal to 1, then the currency_symbol is separated by
a space from a positive monetary value. If equal to 0, then there is no
space between the currency_symbol and a positive monetary
value. |
char n_cs_precedes |
If equal to 1, then the currency_symbol precedes a
negative monetary value. If equal to 0, then the
currency_symbol succeeds a negative monetary value. |
char n_sep_by_space |
If equal to 1, then the currency_symbol is separated by
a space from a negative monetary value. If equal to 0, then there is no
space between the currency_symbol and a negative monetary
value. |
char p_sign_posn |
Represents the position of the positive_sign in a
positive monetary value. |
char n_sign_posn |
Represents the position of the negative_sign in a
negative monetary value. |
The following values are used for p_sign_posn
and
n_sign_posn
:
0 |
Parentheses encapsulate the value and the currency_symbol. |
1 |
The sign precedes the value and currency_symbol. |
2 |
The sign succeeds the value and currency_symbol. |
3 |
The sign immediately precedes the value and currency_symbol. |
4 |
The sign immediately succeeds the value and currency_symbol. |
Example:
#include<locale.h> #include<stdio.h> int main(void) { struct lconv locale_structure; struct lconv *locale_ptr=&locale_structure; locale_ptr=lcoaleconv(); printf("Decimal point: %s",locale_ptr->decimal_point); printf("Thousands Separator: %s",locale_ptr->thousands_sep); printf("Grouping: %s",locale_ptr->grouping); printf("International Currency Symbol: %s",locale_ptr->int_curr_symbol); printf("Currency Symbol: %s",locale_ptr->currency_symbol); printf("Monetary Decimal Point: %s",locale_ptr->mon_decimal_point); printf("Monetary Thousands Separator: %s",locale_ptr->mon_thousands_sep); printf("Monetary Grouping: %s",locale_ptr->mon_grouping); printf("Monetary Positive Sign: %s",locale_ptr->positive_sign); printf("Monetary Negative Sign: %s",locale_ptr->negative_sign); printf("Monetary Intl Decimal Digits: %c",locale_ptr->int_frac_digits); printf("Monetary Decimal Digits: %c",locale_ptr->frac_digits); printf("Monetary + Precedes: %c",locale_ptr->p_cs_precedes); printf("Monetary + Space: %c",locale_ptr->p_sep_by_space); printf("Monetary - Precedes: %c",locale_ptr->n_cs_precedes); printf("Monetary - Space: %c",locale_ptr->n_sep_by_space); printf("Monetary + Sign Posn: %c",locale_ptr->p_sign_posn); printf("Monetary - Sign Posn: %c",locale_ptr->n_sign_posn); }