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_ismbcalnum, _ismbcalnum_l, _ismbcalpha, _ismbcalpha_, _ismbcdigit, _ismbcdigit_l

Visual Studio 2005

Checks whether a multibyte character is an alphanumeric, alpha, or digit character.


int _ismbcalnum
(
   unsigned int c 
);
int _ismbcalnum_l
(
   unsigned int c,
   _locale_t locale
);
int _ismbcalpha
(
   unsigned int c 
);
int _ismbcalpha_l
(
   unsigned int c,
   _locale_t locale
);
int _ismbcdigit
(
   unsigned int c 
);
int _ismbcdigit_l
(
   unsigned int c,
   _locale_t locale
);

Parameters

c: Character to be tested.

locale: Locale to use.

Return Value

Each of these routines returns a nonzero value if the character satisfies the test condition or 0 if it does not. If c <= 255 and there is a corresponding _ismbb routine (for example, _ismbcalnum corresponds to _ismbbalnum), the result is the return value of the corresponding _ismbb routine.

Remarks

Each of these routines tests a given multibyte character for a given condition.

The versions of these functions with the _l suffix are identical except that they use the locale passed in instead of the current locale for their locale-dependent behavior.

Routine	Test condition	Code page 932 example
_ismbcalnum,_ismbcalnum_l	Alphanumeric	Returns nonzero if and only if c is a single-byte representation of an ASCII English letter: See examples for _ismbcdigit and _ismbcalpha.
_ismbcalpha,_ismbcalpha_l	Alphabetic	Returns nonzero if and only if c is a single-byte representation of an ASCII English letter: 0x41<=c<=0x5A or 0x61<=c<=0x7A; or a katakana letter: 0xA6<=c<=0xDF.
_ismbcdigit,_ismbcdigit	Digit	Returns nonzero if and only if c is a single-byte representation of an ASCII digit: 0x30<=c<=0x39.

Requirements

Routine	Required header	Compatibility
_ismbcalnum,_ismbcalnum_l	<mbstring.h>	Windows 95, Windows 98, Windows 98 Second Edition, Windows Millennium Edition, Windows NT 4.0, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003
_ismbcalpha,_ismbcalpha_l	<mbstring.h>	Windows 95, Windows 98, Windows 98 Second Edition, Windows Millennium Edition, Windows NT 4.0, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003
_ismbcdigit,_ismbcdigit_l	<mbstring.h>	Windows 95, Windows 98, Windows 98 Second Edition, Windows Millennium Edition, Windows NT 4.0, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003

For more compatibility information, see Compatibility in the Introduction.

.NET Framework Equivalent

System::Char::IsLetter
System::Char::IsDigit
For _ismbcalnum: Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.

Reference

Character Classification
_ismbc Routines
is, isw Routines
_ismbb Routines

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