NAME

       isalpha - test for an alphabetic character

SYNOPSIS

       #include <ctype.h>

       int isalpha(int c);

DESCRIPTION

       The  isalpha()  function  shall  test  whether  c  is 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 c argument is an int, the value of which the application shall ensure is representable as an unsigned
       char or equal to the value of the macro EOF. If the  argument  has  any  other  value,  the  behavior  is
       undefined.

RETURN VALUE

       The  isalpha() function shall return non-zero if c is an alphabetic character; 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 character classification.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       isalnum() , iscntrl() , isdigit() , isgraph() , islower() , isprint() , ispunct() , isspace() , isupper()
       ,  isxdigit()  ,  setlocale()  ,  the Base Definitions volume of IEEE Std 1003.1-2001, Chapter 7, Locale,
       <ctype.h>, <stdio.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 .

IEEE/The Open Group                                   2003                                            ISALPHA(P)