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2–2 The Automatic Memory Stack
File name 32sii-Manual-E-0424
Printed Date : 2003/4/24 Size : 17.7 x 25.2 cm
T
0.0000 “Oldest” number
Z
0.0000
Y
0.0000
X
0.0000 Displayed
The most "recent" number is in the X–register: this is the number you see in the
display.
In programming, the slack is used to perform calculations, to temporarily store
intermediate results, to pass stored data (variables) among programs and
subroutines, to accept input, and to deliver output.
The X–Register Is in the Display
The X–register is what you see except when a menu, a message, or a
program line is being displayed. You might have noticed that several function
names include an x or y.
This is no coincidence: these letters refer to the X– and Y–registers. For
example,
z
(
raises ten to the power of the number in the X–register
(the displayed number).
Clearing the X–Register
Pressing
z
b
{
º
} always clears the X–register to zero; it is also used
to program this instruction. The
key, in contrast, is context–sensitive. It.
either clears or cancels the current display, depending on the situation: it acts
like
z
b
{
º
} only when the X–register is displayed.
a
also acts like
z
b
{
º
} when the X–register is displayed and digit entry is
terminated (no cursor present). It cancels other displays: menus, labeled
numbers, messages, equation entry, and program entry.