Arithmetic Calculations With Constants - HP -15C Owner's Handbook Manual

Section 3: The Memory Stack, LAST X, and Data Storage
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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.
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