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32
Simple Programming
Introductory Program
The area of
a
sphere program you
wrote, recorded, and executed earlier
showed
you
that the
sequence of
keystrokes used
to
solve a problem
manually
is
the
same
sequence
used
in
a program. Now let's return our
attentio
n
to
that
program to explain
the
infonnation displayed in
PRGM
mode.
First,
set
the
PRGM-RUN
switch
PRGM
~RUN
to
PRGM
so
that the
sequence
of
keystrokes
wi
ll
be
recorded for later execution. Second,
press
[I) CLEAR1PRGMt
to
clear
the
calcu lator of previous
programs.
The display will
show:
00
Thi
s tells
you
that
yo
u
are al the beginning of
progra
m memory
.
Line
00
contain
s
an automatic
stop
instruct
ion
and cannot
be
used
to record
your
program keystrokes.
Program
keystrokes are
recorded in
lines 01
through
49.
(See
figure
below.)
Program Memory
Line
00
Une
01
Line
02
Line
03
Une 47
Une
48
Une
49
As
you
can
see
,
the program memory for the
HP·3
3E
is
separate
from
the four
stack
registers,
the
LAST X
register,
and
the
eight
storage
regis
ters (see
page 4a).
With
00
displayed
in PRGM
mode
,
you are
ready
to
key in
you
r
program. Surface area of a
sphere is
calculated
usi ng
the formua
l
A
=
7Td
2
•
The
short li
st
of keystrokes for the
s urface area
of
a sphere program
is
shown
on
the following
page:
J
~
~
~
~
~
~
!!=
!!=
!!=
~
!!=
!!!=
~
!f=
!!=
e=
~
e=
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