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NAME

       isxdigit - test for a hexadecimal digit

SYNOPSIS

       #include <ctype.h>

       int isxdigit(int c);

DESCRIPTION

       The  isxdigit()  function  shall test whether c is a character of class
       xdigit 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 a character 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 isxdigit() function shall return non-zero if  c  is  a  hexadecimal
       digit; 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() , isalpha() , iscntrl() , isdigit() , isgraph() , islower() ,
       isprint() , ispunct() , isspace() , isupper() ,  the  Base  Definitions
       volume of IEEE Std 1003.1-2001, Chapter 7, Locale, <ctype.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 .