_ismbcalnum, _ismbcalnum_l, _ismbcalpha, _ismbcalpha_, _ismbcdigit, _ismbcdigit_l

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. For more information, see Locale.

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
_ismbcalnum,_ismbcalnum_l	<mbstring.h>
_ismbcalpha,_ismbcalpha_l	<mbstring.h>
_ismbcdigit,_ismbcdigit_l	<mbstring.h>

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.

See Also

Concepts

Character Classification

_ismbc Routines

is, isw Routines

_ismbb Routines