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 g LSTx will retrieve the constant and place it into the X-register(the display). This can be done repeatedly.
Example: Two close stellar neighbors of Earth are Rigil Centaurus(4.3 light-years away) and Sirius(8.7 light-years away). Use the speed of light, c (3.0 * 10^8 meters/second, or 9.5 * 10^15 meters/year), to figure the distances to these stars in meters. (The stack diagrams show only one decimal place.)