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### 3.20 `iswdigit`, `iswdigit_l`—decimal digit wide character test

Synopsis

    #include <wctype.h>
    int iswdigit(wint_t c);

    #include <wctype.h>
    int iswdigit_l(wint_t c, locale_t locale);

Description
`iswdigit` is a function which classifies wide-character values that are decimal digits.

`iswdigit_l` is like `iswdigit` but performs the check based on the locale specified by the locale object locale. If locale is LC_GLOBAL_LOCALE or not a valid locale object, the behaviour is undefined.

Returns
`iswdigit`, `iswdigit_l` return non-zero if c is a decimal digit wide character.

Portability
`iswdigit` is C99. `iswdigit_l` is POSIX-1.2008.

No supporting OS subroutines are required.