iswalpha - test for alphabetic wide character

       For an explanation of the terms used in this section, see attributes(7).
       ┌──────────────────────────────────────────────────────────────────────┬───────────────┬────────────────┐
       │ Interface                                                            │ Attribute     │ Value          │
       ├──────────────────────────────────────────────────────────────────────┼───────────────┼────────────────┤
       │ iswalpha()                                                           │ Thread safety │ MT-Safe locale │
       └──────────────────────────────────────────────────────────────────────┴───────────────┴────────────────┘

       The iswalpha() function is the wide-character equivalent of the isalpha(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-character class "alpha" is  disjoint  from
       the wide-character class "cntrl".

       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".

       Being a subclass of the wide-character class "alnum", the wide-character 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'.

       POSIX.1-2001, C99.

       Standard C library (libc, -lc)

       iswalpha - test for alphabetic wide character

       The behavior of iswalpha() depends on the LC_CTYPE category of the current locale.

       The  iswalpha()  function returns nonzero if wc is a wide character belonging to the wide-character class
       "alpha".  Otherwise, it returns zero.

isalpha(3), iswctype(3)

Linux man-pages 6.9.1                              2024-05-02                                        iswalpha(3)

       C11, POSIX.1-2008.

#include<wctype.h>intiswalpha(wint_twc);