10 The HP-25 Means Painless Programming
II
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Area
of
Ganymede
in
square miles.
Programmed Problem Solving
If
you wanted the surface areas
of
each
of
Jupiter
's
12
moons,
you could
repeat
the above procedure
12
times.
However,
you
might wish to write a
program
that
would calculate
area
of
a
sphere from its diameter, instead
of
pressing all the keys for
each
moon.
To
calculate
the
area
of
a sphere using a program, you should
first
write
the program, then you must
record
the program into
the calculator, and finally you
run
the program to calculate
the answer.
Writing the Program:
You
have already written
it!
A program
is
nothing more than the series
of
keystrokes
you would
execute
to solve the
same
problem manually.
Recording the Program:
To
record the
keystrokes
of
the
pro-
gram into the calculator:
I.
Slide the
PRGM-RUN
switch
PRGM~RUN
to
PRGM
(program).
PRG..,
2. Press
II
a to clear the calculator.
3.
Press
the following keys
in
order. (When you are record-
ing a program, the display gives you information
that
you
will find l/seful later, but you
can
ignore the display for
now.)
:}
II
These
keys are the same keys you pressed to
solve the problem manually.
H3
~
Running
the
Program:
Slide
the
PRGM-RUN
switch
PRGM
.wmJ!J
RUN
back
to
RUN
and press
in
order
~
bB
bB
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