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Section 5: Programming; What Is A Program; Why Write Programs - HP 25 Owner's Handbook Manual

Programmable scientific calculator.
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Section 5
Programming
As we briefly explained in the introduction, calculator program-
ming is as simple
as
pressing the keys
you
would manually press
to solve your
problem.
But even though HP-25 calculator
programming is
simple
to understand
and
use, it is very powerful
,
featuring:
An obvious programming language
.
49 usable
steps
of program memory.
The
ability to
combine
several keystrokes into
each step.
Decision-making capability for
sophisticated
routines.
Several editing operations to
facilitate
corrections.
Together these
features
provide you with the tools necessary
to tackle
complex
problems with unabashed confidence.
What is a Program?
A program is nothing more than
a sequence
of manual key-
strokes that is remembered by the
calculator.
You
can
then
execute the program as often
as you
like with less chance of
error. The
answer
displayed
at
the end of execution is the
same
one you would have obtained by pressing the keys
one at
a time
manually
.
No prior programming
experience
is necessary for
HP-25
calculator
programming
.
Why Write Programs?
Programs
are
written to
save you
time on repetitive calculations.
Once
you
have written
the
keystroke procedure for
solving
a
particular problem and recorded it in the
calculator,
you need
no longer devote
attention
to the individual keystrokes that
make up the procedure. You
can
let the calculator
solve
each
problem
for you.
And because
you
can easily
check
the proce-
dure
in your
program,
you
have more confidence in
your
final
answer since you
don
'
t have to worry
each
time
about
whether
or
not you have pressed
an
incorrect key. The
calculator
per-
forms the drudgery, leaving
your
mind free
for
more creative
work.
73

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