Character Manipulation Function
int isdigit(int c);
int iswdigit(wint_t c);
int _ismbcdigit(unsigned int c);
int _istdigit(_TINT c);
Internationalization (I18n) Function Overview
The isdigit function returns a non-zero value if c is a digit.
iswdigit is the wide character version of isdigit ,
testing the wide character c .
Supported only on Windows platforms, _ismbcdigit is the multibyte equivalent, treating c
as a multibyte character.
_istdigit is the Windows-only Generic version of the function; with the _MBCS or _UNICODE compiler flags determining its mapping to either _ismcbdigit or iswdigit .
I18n Issues
Use the appropriate version of the function as required for internationalization support, noting the following:
On ANSI platforms, there is no multibyte version of isdigit . Instead, convert the character c to a wide character and
call iswdigit .
Prior to calling iswdigit on ANSI platforms, ensure that the locale is set correctly, since
the result of the test condition depends on the locale's LC_CTYPE category setting.
On Windows platforms, the iswdigit test is independent of locale.
The _ismbcdigit function depends on the multibyte code page in effect. By default, the multibyte code page
is set to the system-default ANSI code page obtained from the operating system at program startup.
Use _getmbcp and _setmbcp to query or change
the current multibyte code page, respectively.
Recommended Replacements*
*If you're already using the recommended function, see I18n Issues for other reasons why Globalyzer is detecting the function.
Character Manipulation
Functions
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