.\" Copyright (c) 1991 The Regents of the University of California.
.\" This code is derived from software contributed to Berkeley by
.\" the American National Standards Committee X3, on Information
.\" %sccs.include.redist.man%
.\" @(#)isxdigit.3 5.2 (Berkeley) %G%
.Nd hexadecimal-digit character test
function tests for any hexadecimal-digit character.
macro returns zero if the character tests false and
returns non-zero if the character tests true.