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HP HP-20S - Programming the HP-20 S

HP HP-20S
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Programming
A
program
lets
you
repeat
calculations
without
repeating
keystrokes.
To
enter
a
program,
you
use
the
same
keystrokes
that
you
use
man-
ually,
but
press
the
keys
while
you
are
in
Program
mode.
Your
calculator
will
then
repeat
them
on
command.
The
HP-20S
enables
you
to
use
its
programming
features
in
two
ways.
You
can
write
original
programs
by
having
the
calculator
record
and
repeat
your
keystrokes,
or
you
can
run
any
one
of
six
built-in
programs.
Any
program,
regardless
of
whether
you
entered
it
yourself or
loaded
it
from
the
built-in
program
library,
can
be
run
and
edited.
This
chap-
ter
explains
how
to
do
original
programming
and
editing.
Chapter
7
gives
instructions
on
using
the
built-in
programs.
Before
the
programming
concepts
and
commands
are
explained
in
de-
tail,
try
this
quick
example.
Start
by
writing
out
the
formula,
then
solve
the
problem
from
the
keyboard.
A
Simple
Programming
Example.
To
find
the
cross-sectional
area
of a
pipe
with
a
diameter
of
5
inches,
use
the
formula
wd’
4
A=
Before
doing
the
calculation,
rearrange
the
equation
in
this
order
d2
X ©
+
4
=
A,
Enter
5
in
the display
and
press:
HIEIXEEHE
4
)
giving
a
result
of
19.6350
square
inches.
6:
Programming
61

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