42 The Automatic Memory Stack
To
divide 34 by
21:
Press
34
Imim
21
El
Display
34.
I 34.00
I 21.
I
1.62
34
21
34
is
keyed into X.
34
is
copied into Y.
21
writes
over
the
34
in
X.
The
answer.
Chain Arithmetic
You've
already learned how to key numbers into the calculator
and perform calculations with them. In
each
case you first
needed to position the numbers
in
the
stack
manually using the
Imim
key.
However
, the stack also performs many move-
ments automatically.
These
automat
ic
movements add to its
computing efficiency and ease
of
use, and it
is
these movements
that automatically store intermediate results.
The
stack
auto-
matically
"lifts"
every calculated number
in
the stack when a
new number
is
keyed in because
it
knolVs
that
after it
completes
a calculation, any new digits you key
in
are a
part
of
a new num-
ber. Also, the
stack
automatically
"drops
" when you perform a
two-number operation.
For
example, calculate
16
+ 30 +
11
+ 17 = ?
Note:
If
you press mElfirst, you will begin with
zeros
in
all
of
the stack registers, as the example below.
Press Stack Contents
T 0.00
16 Z
0.00
Y
0.00
16
is
keyed into the displayed
X
16.
X-register.
T
0.00
Z
0.00
Y
16.00
X
16.00
16
is
copied into Y.
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