libwchar2 0.0.10
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iswalpha - test for alphabetic wide character
The iswalpha() function is the wide-character equivalent of the isal- pha(3) function. It tests whether wc is a wide character belonging to the wide-character class alpha
.
The wide-character class alpha
is a subclass of the wide-character class alnum
, and therefore also a subclass of the wide-character class graph
and of the wide-character class print
.
Being a subclass of the wide-character class print
, the wide-charac- ter class alpha
is disjoint from the wide-character class cntrl
.
Being a subclass of the wide-character class graph
, the wide-charac- ter class alpha
is disjoint from the wide-character class space
and its subclass blank
.
Being a subclass of the wide-character class alnum
, the wide-charac- ter class alpha
is disjoint from the wide-character class punct
.
The wide-character class alpha
is disjoint from the wide-character class digit
.
The wide-character class alpha
contains the wide-character classes upper
and lower
.
The wide-character class alpha
always contains at least the letters A
to Z
and a
to z
.
The iswalpha() function returns nonzero if wc
is a wide character belonging to the wide-character class alpha
.
Otherwise, it returns zero.
The behavior of iswalpha() depends on the LC_CTYPE
category of the current locale.