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Section 6
Program Editing
Even the
most experienced programmer finds errors in
hi
s
program
s.
These errors
range from mistakes in
the
origina
l
equations
to
mistakes
in
recordi
ng
the
program
.
Wherever they
occu
r
(hey
need
to
be
found
and
corrected
,
and
the
HP-33E
is designed to
make thi
s
error-checking
process
as easy as
poss
ible
.
Finding the Error
One of the
eas
iest
ways
to find out
if your
program is working properly
is
to
work a
test
case
in which
you either
know the answer
or
the
answer
can
be
eas
il
y
detennined. For example.
if
you have
a program
that
calculates
the
area of a
c ircle
using
the formula Area
=
rr
X
r2
.
you can
easily determine that an input
va lue of
I
for
r
will
give an answer
of
1T.
!SST! Execution.
In
longer
programs
a wrong test-case answer will
se ldom
pinpoint the mi
stake.
For these
cases,
you
can
slow
down
the program execution by using the
ISST!
key
in RUN
mode.
In RUN
mode.
the
!
SST
I key will
execute
your
program
in
st ructions
one at a
time.
When you hold
the
!SST!
key down in
RUN
mode
,
the
program
line
number and keycode are displayed
.
When you
release the
ISST
I
key.
the in struction
is
executed.
Use
IssTI
on
the
simple
area
of a
circle
program
shown
below
to
familiarize
yo
urself with its
operat ion.
Example:
This
program
calcu lates
the area
of a circle using
the
formula:
A
=
rrr2
where
r
is
the
radius. Set the
PRGM-RUN
swi
tch
to
PRGM
PRGM
m m .
RUN
and
press
[IJ
CLEAR
lPRGM!
to
clear
program
me
mory
and di
splay
line
00.
Then
key
in
the
li
st
of key
s
shown
below
.
Keystrokes
ITl
(U·
\R
I.,Gol
000
000
o
Display
00
01-
15 0
02-
15 73
03-
61
70
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