Programming
91
Press
Display
m
~
01
15
04
Calculates the arc sine.
m
§]
02
15
51
Compares
the result to zero.
mIiJ@J@J
03
13
00
If
greater
than zero, display arc
sine.
@]
I
04
03
'}
Oth"w;"
~
I
05
06
I add
@J
I
06
00
I 360 degrees
[±]
I
07
51
I to the arc sine.
To
run the program set the
PRGM-RUN
switch
back
to
RUN
PRGM
.mil
RUN
and pressD I
PRGM
I so
that
the calculator will be-
gin
execution
from step
00
.
Then
key
in
positive
or
negative
values for
x.
The
resultant arc sine will always be positive.
Press Display
m
~
. 5
[R?S]
. 5
rmJ
[E§]
I 0.00 Set degrees mode .
I
30.00
Arc
sine
of
.5 equals 30 degrees.
:=1
-
=
0
~
.5
~~
==~
Key
in
negative value for x .
I
330.00
360 is added to
the
arc sine to give
a positive angle.
Editing a Program
Even
the
most
experienced progra
mmer
finds
errors
in
his pro-
grams.
These
errors
range from mistakes
in
the original equa-
tions to mistakes
in
recording the program.
Wherever
they
occur
they need to be found and
corrected
,
and
the HP-25
is
designed to make this error-checking process as
easy
as
possible.
Finding the Error
One
of
the easiest 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 easily determined.
For
example, if
you have a program
that
calculates the
area
of
a circle using the
formula
area
=
7T
X
r2
, you can easily determine that an input
value
of
I for r will give an
answer
of
7T
.
SST
Execution.
In
longer programs a wrong test-case
answer
will seldom pinpoint the mistake.
For
these cases, you can slow
down program
execution
by using the mil key
in
RUN
mode.
In
RUN
mode,
the_key
will
execute
your program instruc-
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