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The HP-25 Means Painless
Programming
Your HP-25 is a versatile, handheld
electronic calculator
that
uses the powerful Hewlett-Packard logic
system
to compute
answers
to complex mathematical problems in
either of
two
modes
:
•
Manual problem
solving.
You work
step-by-step
through
the toughest
of
problems
,
choosing from among
the dozen
s
of functions
available to calculate
the
correct
answer
quickly
and easily.
•
Programmed problem solving. The H P-25 memorizes
a
sequence
of up to 49 different functions
as you
press them
,
and
then repeats that
sequence automatically as often
as
you wish to
solve a
particular type
of
problem.
That's
all
there is to it! A
progra
m is nothing more than
a se-
quence
of
manual keystrokes that is remembered
by
the
calcu-
lator. You
can
then execute the
progra
m
as
often
as
you
like.
No
prior computer
prog
rammin
g
experience
is
necessary for
H P-25
calc
ulator
prog
rammin
g.
To
see
the close relationship between the manual
so
lution to
a
problem
a
nd
a
programmed
solution
,
let's
solve a
problem
manually, and then use a program to
solve
the
same
problem
and
others like it.
Manual Problem Solving
To calculate the
surface
area
of a sphere,
the formula
A
=
7r d
2
can be used,
where: A
is the
surface area
,
7r
is the value of pi
,
3.1415
...
,
and d
is the diameter
of
the
sphere.
Ganymede
,
one
of
Jupiter'
s
12 moons
,
has
a
diameter
of 3200
miles. To use the H P-25 to manually
compute the area of
Ganymede
,
you
can press the following keys in
order:
First, slide
the
calculator
O F F " O N
switch
to
ON, and slide
the
P R G M " RUN
switch
to RUN.
Then press
Display
bB!33
~bH
1
3200.
II
=~--
!±}
1
1
0240000.001
9
Di
a
meter
of Ganymede
.
Square
of
the diameter.
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