The Automatic Memory Stack
2–9
File name 32sii-Manual-E-0424
Printed Date : 2003/4/24 Size : 17.7 x 25.2 cm
See appendix B for a comprehensive list of the functions that save
x
in the
LAST X register.
Correcting Mistakes with LAST X
Wrong
On
e–Number Function
If you execute the wrong one–number function, use
z
to retrieve
the number so you can execute the correct function. (Press
first
if you
want to clear the incorrect result, from the stack.)
Since
{
P
and
{
S
don't cause the stack to drop, you can
recover from these functions in the same manner as from one–number
functions.
Example:
Suppose that you had just computed In 4.7839
×
(3.879
×
10
5
) and wanted
to find its square root, but pressed
*
by mistake. You don't have to start
over! To find the correct result, press
z
<
.
Mistakes with a Two–number operation
If you make a mistake with a two–number operation, (
,
,
y
,
p
,
0
or
.
), you can correct it by using
z
and
inverse
of the
two–number function (
or
,
p
or
y
,
.
or
0
).
1.
Press
z
to recover the second number (
x
just before the
operation).
2.
Execute the inverse operation. This returns the number that was originally
first. The second number is still in the LAST X register. Then:
If you had used the
wrong function
, press
z
again to
restore the original stack contents. Now execute the correct function.
If you had used the
wrong second number
, key in the correct one and
execute the function.
If you had used the
wrong first number,
key in the correct first number, press
z
to recover the second number, and execute the function again.
(Press
first
if you want to clear the incorrect result from the stack.)
Example: