Provided by: manpages-posix-dev_2.16-1_all 
NAME
iswalpha - test for an alphabetic wide-character code
SYNOPSIS
#include <wctype.h> int iswalpha(wint_t wc);
DESCRIPTION
The iswalpha() function shall test whether wc is a wide-character code representing a character of class
alpha in the program's current locale; see the Base Definitions volume of IEEE Std 1003.1-2001, Chapter
7, Locale.
The wc argument is a wint_t, the value of which the application shall ensure is a wide-character code
corresponding to a valid character in the current locale, or equal to the value of the macro WEOF. If the
argument has any other value, the behavior is undefined.
RETURN VALUE
The iswalpha() function shall return non-zero if wc is an alphabetic wide-character code; otherwise, it
shall return 0.
ERRORS
No errors are defined.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
To ensure applications portability, especially across natural languages, only this function and those
listed in the SEE ALSO section should be used for classification of wide-character codes.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
iswalnum() , iswcntrl() , iswctype() , iswdigit() , iswgraph() , iswlower() , iswprint() , iswpunct() ,
iswspace() , iswupper() , iswxdigit() , setlocale() , the Base Definitions volume of
IEEE Std 1003.1-2001, Chapter 7, Locale, <stdio.h>, <wchar.h>, <wctype.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition,
Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers,
Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The
original Standard can be obtained online at http://www.opengroup.org/unix/online.html .