HP 35s HP 35s scientific calculator - User Guide - Page 54
The LAST X Register
UPC - 000000000000
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T Z Y 1X 1 1 11 2 1 1 1 2 2C033 3 4 5 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 returns this value into the X-register. 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