mirror of
https://github.com/lcn2/calc.git
synced 2025-08-19 01:13:27 +03:00
49 lines
1016 B
Plaintext
49 lines
1016 B
Plaintext
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
|
|
|
|
LIBRARY
|
|
none
|
|
|
|
SEE ALSO
|
|
oldvalue, eval
|