172 Appendix A: The Automatic Memory StackTermination of Digit Entry

The first digit keyed in after digit entry has been terminated replaces the number already in the displayed X-register. Digit entry is automatically terminated when any key is pressed (except for digit entry keys — digit keys,., Þ, and É— and prefix keys — f, g,?, :, and i).

Stack Lift

When the stack lifts, the number in each stack register is copied into the register above, and the number formerly in the T-register is lost. The number formerly in the X-register is then contained in both the X-register and the Y-register.

When a number is entered into the displayed X-register — either from the keyboard, from a storage register (using :), or from the LAST X register (using F) — the stack usually lifts first. The stack does not lift if the last key pressed before a number is entered was one of the following: \, O, _, ^, Aor C.* If one of these keys was the last key pressed, the number in the displayed X-register is replaced when a new number is entered.

Rearranging Numbers in the StackThe keyPressing ~ exchanges the numbers in the X- andY-registers.

Certain functions (Ò, Ï, !, E, V, Ý, #, Ö, v, R, and Q) return answers to the Y-register as well as to the displayed X-register. The ~key, since it exchanges the number in the Y-register with that in the displayed X-register, is used to display the second number calculated.

The Key

When d (roll down) is pressed the number in each stack register is copied into the register below, and the number formerly in the X-register is copied into the T-register.

*In addition, the stack does not lift when a number is entered if the last operation performed

was storing a number into a financial register. For example, the stack will not lift when a number is entered following the sequence 100000$, but will lift when a number is entered following the sequence 100000$M. Note also that although the stack lifts when \is pressed, it does not lift when a number is entered after \is pressed.

File name: hp 12c_user's guide_English_HDPMBF12E44

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Printered Date: 2005/7/29

Dimension: 14.8 cm x 21 cm