NAME
    iserror - test whether a value is an error value

SYNOPSIS
    iserror(x)

TYPES
    x		any

    return	zero or positive integer < 32768

DESCRIPTION
    If x is not an error value, zero is returned.
    If x is an error value, iserror(x) returns its error type.

EXAMPLE
    ; a = error(99)
    print iserror(a), iserror(2 + a), iserror(2 + "a"), iserror(2 + 3)
    99 99 3 0

LIMITS
    none

LINK LIBRARY
    none

SEE ALSO
    error, errorcodes, stoponerror,
    isassoc, isatty, isblk, isconfig, isdefined, iseven, isfile,
    ishash, isident, isint, islist, ismat, ismult, isnull, isnum, isobj,
    isobjtype, isodd, isprime, isrand, israndom, isreal, isrel,
    issimple, issq, isstr, istype

## Copyright (C) 1999-2006  Landon Curt Noll
##
## Calc is open software; you can redistribute it and/or modify it under
## the terms of the version 2.1 of the GNU Lesser General Public License
## as published by the Free Software Foundation.
##
## Calc is distributed in the hope that it will be useful, but WITHOUT
## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
## or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU Lesser General
## Public License for more details.
##
## A copy of version 2.1 of the GNU Lesser General Public License is
## distributed with calc under the filename COPYING-LGPL.  You should have
## received a copy with calc; if not, write to Free Software Foundation, Inc.
## 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
##
## Under source code control:	1995/12/18 03:30:59
## File existed as early as:	1995
##
## chongo <was here> /\oo/\	http://www.isthe.com/chongo/
## Share and enjoy!  :-)	http://www.isthe.com/chongo/tech/comp/calc/
