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HP HP-67 - Routine-Subroutine Usage

HP HP-67
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204
Subroutines
Routine-Subroutine
Usage
Subroutines
give
you
extreme
versatility
in
programming.
A
sub-
routine
can
contain
a loop,
or
it
can
be
executed
as
part
of
a
loop.
Another
common
and
space-saving
trick
is
to
use
the
same
routine
both
as
a
subroutine
and
as
part
of
the
main
program.
Example:
The
program below
simu-
lates
the
throwing
of
a
pair
of
dice,
pausing
to
display
first
the
value
of
one
die
(an
integer
from
1
to 6)
and
then
pausing
to
display
the
value
of
the
second
die
(another
integer
from
1
to
6).
Finally
the
values
of
the
two
dice
are
added
together
to
give
the
total
value.
The
‘‘heart’”
of
the
program
is
a
random
number
generator
(actually
a
pseudo
random
number
generator)
that
is
executed
first
as
a
sub-
routine
and
then
as
part
of
the
main
program.
When
you
key
in
a
first
number,
called
a
‘‘seed’’,
and
press
3,
the
digit
for
the
first
die
is
generated
and
displayed
using
the
f#
(€]
routine
as
a subroutine.
Then
the
digit
for
the
second
die
is
generated
using
the
same
routine
as
part
of
the
main
program.
To
key
in
the
program:
Slide
the
Program
Mode
switch
wrem
[[[[Illrun
to
W/PRGM.
Press
Display
fooo
(00157
31
—s5-00]
(€)
executed
first
as
subroutine.
oes
%“>a§
o
STO
a
]
©

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