HP 12C, User Manual

Page: 235 / 288

Appendix A: RPN and the Stack 235
File name: HP 12c Pt Converted_user's guide_English_HDP0F123E02_080207 Page: 235 of 281
Printed Date: { 2007/8/2Dimension: 14.8 cm x 21 cm
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.
Pressing
d
four times successively displays the numbers in the Y-, Z-, and
T-registers and returns the numbers to their original registers.
One-Number Functions and the Stack
One-number mathematics and number-alteration functions —
y
,
r
,
°
,
>
,
¡
,
e
,
B
,
Ñ
, and
T
— use only the number in the displayed X-register.
When the key is pressed, the function is performed upon the number in the
X-register, and the answer is then placed into the X-register. The stack does not lift,
so the number formerly in the X-register does not get copied into the Y-register; but
this number is copied into the LAST X register. The numbers in the Y-, Z-, and
T-registers are not affected when a one number function is performed.
Two-Number Functions and the Stack
Two-number functions —
+
,
-
,
§
,
z
,
q
,
b
,
à
, and
Z
— use the
numbers in both the X- and the Y-registers.