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_ismbcalnum, _ismbcalnum_l, _ismbcalpha, _ismbcalpha_l, _ismbcdigit, _ismbcdigit_l

  • Članek

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

Important

This API cannot be used in applications that execute in the Windows Runtime. For more information, see CRT functions not supported in Universal Windows Platform apps.

Syntax

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. Otherwise, they return 0. If c<= 255 and there's 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_l Digit Returns nonzero if and only if c is a single-byte representation of an ASCII digit: 0x30<=c<=0x39.

By default, this function's global state is scoped to the application. To change this behavior, see Global state in the CRT.

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.

See also

Character classification
_ismbc routines
is, isw routines
_ismbb routines