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Appendix B
Combined Arithmetic
Processes
The
HP-80 performs
combined arithmetic operat
ions-serial,
mixed
and chain calculations-with
ease. If
you
read
Appendix A
(Design
Concepts) you now know
how
the
operational
stack works and can
apply
that
knowledge to
the following
examples.
Automatic Doubling, Squaring
If you want
to double or
square a
number, it's not necessary to
press
that number
twice.
Merely enter the number, save
it
and
press
+
to
double
or
x to
square
the
number. For
example,
to
double
3,
Enter:
See Displayed:
l---------l.~
_
3 doubled
The following
illustrates the data
flow
in the
stack.
Press
See
Remarks
3
3.
3 is
keyed
into X.
SAVE
+
3.00
3 is loaded into X and Y.
+
6.00
Contents
of
X
and
Yare added;
result (6) is loaded into
X.
To square 3,
Enter:
See
Displayed:
'----------;.~
_
3
squared
Again,
in the
stack,
Press
See
Remarks
3
3.
3
is keyed into
X.
SAVE
+
3.00
3
is
loaded
into X
and
Y.
X
9.00
Co ntents of X and Yare multiplied and the
product (9) is loaded into X.
55
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