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ISDIGIT(3) Library Functions Manual ISDIGIT(3) NAME isdigit, isnumber, isdigit_l, isnumber_l -- decimal-digit character test LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <ctype.h> int isdigit(int c); int isnumber(int c); int isdigit_l(int c, locale_t loc); int isnumber_l(int c, locale_t loc); DESCRIPTION The isdigit() and isdigit_l() functions test for a decimal digit character. Regardless of locale, this includes the following characters only: ``0'' ``1''``2''``3''``4'' ``5'' ``6''``7''``8''``9'' The isnumber() and isnumber_l() functions behave similarly to isdigit() and isdigit_l(), but may recognize additional characters, depending on the cur- rent locale setting. The value of the argument must be representable as an unsigned char or the value of EOF. The _l-suffixed versions take an explicit locale argument, whereas the non- suffixed versions use the current global or per-thread locale. RETURN VALUES The isdigit(), isdigit_l(), isnumber(), and isnumber_l() functions return zero if the character tests false and return non-zero if the character tests true. COMPATIBILITY The 4.4BSD extension of accepting arguments outside of the range of the unsigned char type in locales with large character sets is considered obso- lete and may not be supported in future releases. The iswdigit() or iswdigit_l() function should be used instead. SEE ALSO ctype(3), ctype_l(3), iswdigit(3), iswdigit_l(3), multibyte(3), xlocale(3), ascii(7) STANDARDS The isdigit() function conforms to ISO/IEC 9899:1990 ("ISO C90"). The is- digit_l() function conforms to IEEE Std 1003.1-2008 ("POSIX.1"). HISTORY The isnumber() function appeared in 4.4BSD. FreeBSD ports 15.quarterly December 19, 2022 ISDIGIT(3)
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | COMPATIBILITY | SEE ALSO | STANDARDS | HISTORY
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