The Last X Register - HP 35s User Manual

T
Z
Y
1 X
1
1. Lifts the stack
2. Lifts the stack and replicates the X–register.
3. Overwrites the X–register.
4. Clears x by overwriting it with zero.
5. Overwrites x (replaces the zero.)

The LAST X Register

The LAST X register is a companion to the stack: it holds the number that was in the
X–register before the last numeric function was executed. (A numeric function is an
operation that produces a result from another number or numbers, such as
 
Pressing
This ability to retrieve the "last x" has two main uses:
1. Correcting errors.
2. Reusing a number in a calculation.
See appendix B for a comprehensive list of the functions that save x in the LAST X
register.
2-8
RPN: The Automatic Memory Stack
1

1 1
2
returns this value into the X–register.
1
2 C
2
3 4
1 1
3
0 3
5

.)