.\" Copyright (c) 1991 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" the American National Standards Committee X3, on Information
.\" Processing Systems.
.\"
.\" %sccs.include.redist.man%
.\"
.\"     @(#)isxdigit.3	5.4 (Berkeley) 10/27/91
.\"
.Dd 
.Dt ISXDIGIT 3
.Os
.Sh NAME
.Nm isxdigit
.Nd hexadecimal-digit character test
.Sh SYNOPSIS
.Fd #include <ctype.h>
.Ft int
.Fn isxdigit "int c";
.Sh DESCRIPTION
The
.Fn isxdigit
function tests for any hexadecimal-digit character.
In the ASCII character set, this includes the following characters:
.sp
.Bl -column \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__
.It \&060\ ``0'' \t061\ ``1'' \t062\ ``2'' \t063\ ``3'' \t064\ ``4''
.It \&065\ ``5'' \t066\ ``6'' \t067\ ``7'' \t070\ ``8'' \t071\ ``9''
.It \&101\ ``A'' \t102\ ``B'' \t103\ ``C'' \t104\ ``D'' \t105\ ``E''
.It \&106\ ``F'' \t141\ ``a'' \t142\ ``b'' \t143\ ``c'' \t144\ ``d''
.It \&145\ ``e'' \t146\ ``f''
.El
.Sh RETURN VALUES
The
.Fn isxdigit
function returns zero if the character tests false and
returns non-zero if the character tests true.
.Sh SEE ALSO
.Xr ctype 3 ,
.Xr ascii 7
.Sh STANDARDS
The
.Fn isxdigit
function conforms to
.St -ansiC .