ISXDIGIT(3)

NAME
3.11 `isxdigit'--hexadecimal digit predicate

SYNOPSIS
     #include <ctype.h>
     int isxdigit(int C);

DESCRIPTION
`isxdigit' is a macro which classifies ASCII integer values by table lookup. It is a predicate returning non-zero for hexadecimal digits, and `0' for other characters. It is defined only when `isascii'(C) is true or C is EOF.
   You can use a compiled subroutine instead of the macro definition by undefining the macro using ``#undef isxdigit''.

RETURNS
`isxdigit' returns non-zero if C is a hexadecimal digit (`0'-`9', `a'-`f', or `A'-`F').

PORTABILITY
`isxdigit' is ANSI C.
   No supporting OS subroutines are required.

SEE ALSO
isxdigit is part of the library. The full documentation for is maintained as a Texinfo manual. If info and are properly installed at your site, the command

    info

will give you access to the complete manual.