Share via

isalnum, iswalnum

  • Article

intisalnum(intc**);**

intiswalnum(wint_tc**);**

Each of these routines returns true if c is a particular representation of an alphanumeric character.

Routine Required Header Compatibility
isalnum <ctype.h> ANSI, Win 95, Win NT
iswalnum <ctype.h> or <wchar.h> ANSI, Win 95, Win NT

For additional compatibility information, see Compatibility in the Introduction.

Libraries

LIBC.LIB Single thread static library, retail version
LIBCMT.LIB Multithread static library, retail version
MSVCRT.LIB Import library for MSVCRT.DLL, retail version

Return Value

isalnum returns a non-zero value if either isalpha or isdigit is true for c, that is, if c is within the ranges A – Z, a – z, or 0 – 9. iswalnum returns a non-zero value if either iswalpha or iswdigit is true for c. Each of these routines returns 0 if c does not satisfy the test condition.

The result of the test condition for the isalnum function depends on the LC_CTYPE category setting of the current locale; see setlocale for more information. For iswalnum, the result of the test condition is independent of locale.

Parameter

c

Integer to test

Generic-Text Routine Mappings

TCHAR.H Routine _UNICODE & _MBCS Not Defined _MBCS Defined _UNICODE Defined
_istalnum isalnum _ismbcalnum iswalnum

Character Classification Routines |  Locale Routines |  is, isw Function Overview