HP 33s hp 33s_user's manual_English_E_HDPM20PIE56.pdf - Page 47
The LAST X Register
UPC - 082916001456
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During program entry, b deletes the currently-displayed program line and cancels program entry. During digit entry, b backspaces over the displayed number. If the display shows a labeled number (such as /) ), pressing or b cancels that display and shows the X-register. When viewing an equation, b displays the cursor at the end the equation to allow for editing. During equation entry, b backspaces over the displayed equation, one function at a time. For example, if you intended to enter 1 and 3 but mistakenly entered 1 and 2, this is what you should do to correct your error: T Z Y X1 1 2 1 1 1 1 1 2 0 3 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. RPN: The Automatic Memory Stack 2-7