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Programming
around the
follow
ing
step
,
which can contain
an
unconditional
branch
or
a
simpler instruction
(EmJ
for example). The
pro-
gram
makes
a
dec
ision for you!
'
Conditional Test
I--------I~
~~~
..)
Program execution branches
around one step if the answer
to the test is NO.
The eight different conditionals
in
your
H
P-25
are shown here
.
I
n
each case
,
the tests are
made
o
n
the
10-digit
numbers
and
two-digit exponents actually stored
in
the
stack
registers
,
not
on
the
displ ayed values
.
D
Ix<yl
tests
to
see
if
the value
in
the X-register
is
less
than
the value in the Y-register.
D Ix"y
l
tests
to see if
the
value
in the
X-register
is
greater
than
or equal
to the value in
the Y-register.
D
lRtil
tests
to
see
if the value in
the X-register
is not equal to
the
value
in the
Y-register.
D
~
tests to
see
if
the
value
in the X-register
is
equal to
the
value in the Y-register.
iii
18I
tests
to
see
if the value in the X-register
is less
than
zero
.
iii
Inol tests
to
see
if
the value
in the
X-register
is
greater
than
or equal to zero
.
iii
luol
tests to
see
if
the value
in the
X-register
is not
equal
to zero.
iii
rx=oJ
tests to
see
if the
value in the X-register
is
equal to
zero
.
Example Program.
This
program
calculates
the
arc sine of an
input value
x
(x
must
be within the
limits
of
-
1
and
+
1)
.
The
program tests
the
resulting angle,
and if it
is
not
greater
than
zero
,
adds
360 degrees to
it.
The
angle
displayed by
the pro-
gram
,
then
,
is
always positive.
To key in the program set
the mode switch to PRGM
PRGM
~
RUN
and press
D
I
PRGM
Ito
clear program memory and
display
step
00. Then
key
in the following
li st
of keys.
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