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HP HP-67 User Manual

HP HP-67
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208
Subroutines
Problems
1.
Look
closely
at
the
program
for
finding
roots
r;
and
r,
of
a
quadratic
equation
(page
200).
Can
you
see
other
instruc-
tions
that
could
be
replaced
by
a
subroutine?
(Hint:
look
at
steps
013
through
016
and
steps
021
through
024.)
Modify
the
pro-
gram
by
using
another
subroutine
and
run
it
to
find
the
roots
of
x2+x—-—6=0;0f3x2
+2x
—
1
=0.
(Answers:
2,
—3;
0.33,
—1)
How
many
more
steps
of
program
memory
did
you
save?
The
surface
area
of
a
sphere
can
be
calculated
according
to
the
equation
A =
4mr?,
where
r
is
the
radius.
The
formula
for
3
finding
the
volume
of a
sphere
is
V
=
dmm
.
This
may
also
be
r
X4
expressed
as
V
=
3
Create
and
load
a
program
to
calculate
the
area
A
of
a
sphere
given
its
radius
r.
Define
the
program
with
{9
and
and
include
an
initialization
routine
to
store
the
value
of
the
radius.
Then
create
and
load
a
second
program
to
calculate
the
volume
r
XA
V
of
a
sphere,
using
the
equationV
=
.
Define
this
sec-
ond
program
with
[zl
and
(RTN],
and
include
the
instruction
(1)
to
use
a
portion
of
program
[
as
a
subroutine
calculating
area.
Run
the
two
programs
to
find
the
area
and
volume
of
the
planet
earth,
a
sphere
with
a
radius
of
about
3963
miles.
Of
the
earth’s
moon,
a
sphere
with
a
radius
of
about
1080
miles.
Answers:
Earth
area
=
197359487.5
square
miles
Earth
volume
=
2.6071188
X
10!
cubic
miles
Moon
area
=
14657414.69
square
miles
Moon
volume
=
5276669290
cubic
miles

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HP HP-67 Specifications

General IconGeneral
BrandHP
ModelHP-67
CategoryCalculator
LanguageEnglish

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