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NAME
saveval - enable or disable saving of values
SYNOPSIS
saveval(arg)
TYPES
arg any
return null value
DESCRIPTION
When evaluation of a line of statements at top level starts, a
"saved value" for that line is assigned the null value. When saving
is enabled (the initial state) and a statement being evaluated is an
expression or a return statement, the value returned by that expression
or statement replaces the current saved value; on completion of
evaluation of the line, the saved value, if it is not null, updates
the "oldvalue".
This saving of values is enabled or disabled by calling saveval(arg)
with an argument arg that tests as nonzero or zero,
Whether saving is enabled or disabled does not affect the operation of
eval(str).
EXAMPLE
; saveval(1);
; a = 27;
.
27
; saveval(0);
; a = 45
.
27
; saveval(1);
; a = 63
.
63
LIMITS
none
LINK LIBRARY
none
SEE ALSO
oldvalue, eval
## Copyright (C) 1999 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: 1997/09/06 20:03:35
## File existed as early as: 1997
##
## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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