Section (3) iswdigit
iswdigit — test for decimal digit wide character
iswdigit() function is
the wide-character equivalent of the isdigit(3) function. It
wc is a
wide character belonging to the wide-character class
The wide-character class digit is a subclass of the wide-character class xdigit, and therefore also a subclass of the wide-character class alnum, of the wide-character class graph and of the wide-character class print.
Being a subclass of the wide character class print, the wide-character class digit is disjoint from the wide-character class cntrl.
Being a subclass of the wide-character class graph, the wide-character class digit is disjoint from the wide-character class space and its subclass blank.
Being a subclass of the wide-character class alnum, the wide-character class digit is disjoint from the wide-character class punct.
The wide-character class digit is disjoint from the wide-character class alpha and therefore also disjoint from its subclasses lower, upper.
The wide-character class digit always contains exactly the digits _zsingle_quotesz_0_zsingle_quotesz_ to _zsingle_quotesz_9_zsingle_quotesz_.
returns nonzero if
is a wide character belonging to the wide-character class
digit. Otherwise, it returns zero.
For an explanation of the terms used in this section, see attributes(7).
||Thread safety||MT-Safe locale|
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