Termination Of Digit Entry; Stack Lift; Rearranging Numbers In The Stack; The Key - HP 12c User Manual

172 Appendix A: The Automatic Memory Stack

Termination 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, _, ^, A or
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 Stack

The key
Pressing ~ exchanges the numbers in the X- and
Y-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
Printered Date: 2005/7/29
Page: 172 of 209
Dimension: 14.8 cm x 21 cm