HP 15c Collector's Edition

Section 3: The Memory Stack, LAST X, and Data Storage 39
T
y y y y
Z
y x y x
Y
x
13
x
65
X 13 5 65 4
Keys:
5
*
4
T
y y y y
Z
x y x y
Y 65
x
69
x
X 4 69 3 207
Keys:
+
3
*
Arithmetic Calculations With Constants
There are three ways (without using a storage register) to manipulate the
memory stack to perform repeated calculations with a constant:
1. Use the LAST X register.
2. Load the stack with a constant and operate upon different numbers.
(Clear the X-register every time you want to change the number
operated upon.)
3. Load the stack with a constant and operate upon an accumulating
number. (Do not change the number in the X-register.)
LAST X. Use your constant in the X-register (that is, enter it second) so
that it always will be saved in the LAST X register. Pressing | K will
retrieve the constant and place it into the X-register (the display). This can
be done repeatedly.