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.TH ISWALPHA 3  2014-01-28 "GNU" "Linux Programmer's Manual"
.SH NAME
iswalpha \- test for alphabetic wide character
.SH SYNOPSIS
.nf
.B #include <wctype.h>
.sp
.BI "int iswalpha(wint_t " wc );
.fi
.SH DESCRIPTION
The
.BR iswalpha ()
function is the wide-character equivalent of the
.BR isalpha (3)
function.
It tests whether
.I wc
is a wide character
belonging to the wide-character class "alpha".
.PP
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".
.PP
Being a subclass of the wide-character class "print",
the wide-character class
"alpha" is disjoint from the wide-character class "cntrl".
.PP
Being a subclass of the wide-character class "graph",
the wide-character class "alpha" is disjoint from
the wide-character class "space" and its subclass "blank".
.PP
Being a subclass of the wide-character class "alnum",
the wide-character class "alpha" is disjoint from the
wide-character class "punct".
.PP
The wide-character class "alpha" is disjoint from the wide-character class
"digit".
.PP
The wide-character class "alpha" contains the wide-character classes "upper"
and "lower".
.PP
The wide-character class "alpha" always contains at least the
letters \(aqA\(aq to \(aqZ\(aq and \(aqa\(aq to \(aqz\(aq.
.SH RETURN VALUE
The
.BR iswalpha ()
function returns nonzero
if
.I wc
is a wide character
belonging to the wide-character class "alpha".
Otherwise, it returns zero.
.SH ATTRIBUTES
.SS Multithreading (see pthreads(7))
The
.BR iswalpha ()
function is thread-safe with exceptions.
It can be safely used in multithreaded applications, as long as
.BR setlocale (3)
is not called to change the locale during its execution.
.SH CONFORMING TO
C99.
.SH NOTES
The behavior of
.BR iswalpha ()
depends on the
.B LC_CTYPE
category of the
current locale.
.SH SEE ALSO
.BR isalpha (3),
.BR iswctype (3)
.SH COLOPHON
This page is part of release 3.74 of the Linux
.I man-pages
project.
A description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
\%http://www.kernel.org/doc/man\-pages/.