iscsym-functions.md

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Learn more about: iscsym, iscsymf, __iscsym, __iswcsym, __iscsymf, __iswcsymf, _iscsym_l, _iswcsym_l, _iscsymf_l, _iswcsymf_l	iscsym, iscsymf, __iscsym, __iswcsym, __iscsymf, __iswcsymf, _iscsym_l, _iswcsym_l, _iscsymf_l, _iswcsymf_l	11/04/2016	_iswcsym_l __iswcsym __iscsym _iswcsymf_l _iscsym_l __iswcsymf __iscsymf _iscsymf_l	msvcrt.dll msvcr80.dll msvcr90.dll msvcr100.dll msvcr100_clr0400.dll msvcr110.dll msvcr110_clr0400.dll msvcr120.dll msvcr120_clr0400.dll ucrtbase.dll api-ms-win-crt-string-l1-1-0.dll	DLLExport	apiref	_iswcsym_l _iswcsymf_l iscsymf iswcsymf __iswcsym __iswcsymf iscsym iswcsym __iscsym _iscsym_l _iscsymf_l __iscsymf ctype/iscsym ctype/iscsymf ctype/__iscsym ctype/__iscsymf ctype/__iscsym_l ctype/__iscsymf_l ctype/__iswcsym ctype/__iswcsymf ctype/__iswcsym_l ctype/__iswcsymf_l	iscsymf_l function iswsym_l function _iswcsym_l function iscsym_l function _iscsymf_l function _iswcsymf_l function _iscsym_l function __iscsym function __iswcsymf function iswsymf_l function __iscsymf function __iswcsym function iscsym function iscsymf function	944dfb99-f2b8-498c-9f55-dbcf370d0a2c

iscsym, iscsymf, __iscsym, __iswcsym, __iscsymf, __iswcsymf, _iscsym_l, _iswcsym_l, _iscsymf_l, _iswcsymf_l

Determine if an integer represents a character that may be used in an identifier.

Syntax

int __iscsym(
   int c
);
int __iswcsym(
   wint_t c
);
int __iscsymf(
   int c
);
int __iswcsymf(
   wint_t c
);
int _iscsym_l(
   int c,
   _locale_t locale
);
int _iswcsym_l(
   wint_t c,
   _locale_t locale
);
int _iscsymf_l(
   int c,
   _locale_t locale
);
int _iswcsymf_l(
   wint_t c,
   _locale_t locale
);
#define iscsym __iscsym
#define iscsymf __iscsymf

Parameters

c
Integer to test. c should be in the range of 0-255 for the narrow character version of the function.

locale
The locale to use.

Return value

Both __iscsym and __iswcsym return a nonzero value if c is a letter, underscore, or digit. Both __iscsymf and __iswcsymf return a nonzero value if c is a letter or an underscore. Each of these routines returns 0 if c doesn't satisfy the test 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.

Remarks

These routines are defined as macros unless the preprocessor macro _CTYPE_DISABLE_MACROS is defined. When you use the macro versions of these routines, the arguments can be evaluated more than once. Be careful when you use expressions that have side effects within the argument list.

For backward compatibility, iscsym and iscsymf are defined as macros only when __STDC__ isn't defined or is defined as 0; otherwise they're undefined.

Requirements

Routine	Required header
iscsym, iscsymf, __iscsym, __iswcsym, __iscsymf, __iswcsymf, _iscsym_l, _iswcsym_l, _iscsymf_l, _iswcsymf_l	C: <ctype.h> C++: <cctype> or <ctype.h>

The iscsym, iscsymf, __iscsym, __iswcsym, __iscsymf, __iswcsymf, _iscsym_l, _iswcsym_l, _iscsymf_l, and _iswcsymf_l routines are Microsoft-specific. For more compatibility information, see Compatibility.

See also

Character classification
Locale
is, isw routines