<locale.h> – C语言标准库
locale.h头文件定义了特定的位置设置，如日期格式和货币符号。有一个重要的结构struct lconv和两个重要的函数，下面列出一些宏定义。
库宏
以下是在标头中定义的宏，这些宏将被用在下面列出的两个函数：
| S.N. | 宏及说明 |
|---|---|
| 1 |
LC_ALL Set everything. |
| 2 |
LC_COLLATE Affects strcoll and strxfrm functions. |
| 3 |
LC_CTYPE Affects all character functions. |
| 4 |
LC_MONETARY Affects the monetary information provided by localeconv function. |
| 5 |
LC_NUMERIC Affects decimal-yiibai formatting and the information provided by localeconv function. |
| 6 |
LC_TIME Affects the strftime function. |
库函数
以下是头locale.h中定义的函数：
| S.N. | 功能及说明 |
|---|---|
| 1 |
char *setlocale(int category, const char *locale) 设置或读取位置相关的信息。 |
| 2 |
struct lconv *localeconv(void) 设置或读取位置相关的信息。 |
库结构
typedefstruct{char*decimal_yiibai;char*thousands_sep;char*grouping;char*int_curr_symbol;char*currency_symbol;char*mon_decimal_yiibai;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;} lconv
以下是每个字段的描述：
| S.N. | 字段＆说明 |
|---|---|
| 1 |
decimal_yiibai Decimal yiibai character used for non-monetary values. |
| 2 |
thousands_sep Thousands place separator character used for non-monetary values.. |
| 3 |
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. |
| 4 |
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. |
| 5 |
currency_symbol The local symbol used for currency. |
| 6 |
mon_decimal_yiibai The decimal yiibai character used for monetary values. |
| 7 |
mon_thousands_sep The thousands place grouping character used for monetary values. |
| 8 |
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. |
| 9 |
positive_sign The character used for positive monetary values. |
| 10 |
negative_sign The character used for negative monetary values. |
| 11 |
int_frac_digits Number of digits to show after the decimal yiibai in international monetary values. |
| 12 |
frac_digits Number of digits to show after the decimal yiibai in monetary values. |
| 13 |
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. |
| 14 |
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. |
| 15 |
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. |
| 16 |
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. |
| 17 |
p_sign_posn Represents the position of the positive_sign in a positive monetary value. |
| 18 |
n_sign_posn Represents the position of the negative_sign in a negative monetary value. |
使用以下值为p_sign_posn和n_sign_posn：
| 值 | 描述 |
|---|---|
| 0 | 括号封装值和CURRENCY_SYMBOL的。the currency_symbol. |
| 1 | 符号之前的值和currency_symbol. |
| 2 | 该标志成功的值和currency_symbol. |
| 3 | 符号立即之前的值和 currency_symbol. |
| 4 | 符号立即成功的值和currency_symbol. |