wctype

   Used for defining a character class. The value returned by this
   function is used in calls to the iswctype function.

   Format

     #include  <wctype.h> (ISO C)

     #include  <wchar.h> (XPG4)

     wctype_t wctype  (const char *char_class);
 

Additional information available:

Argument        Description     Return_Values   Example