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Section 3
Simple Programming
What Is a Program?
A program is nothing more than a series of calculator keystrokes that
you would press to solve a problem manually. The HP-33E remembers
these keystrokes when you key them in, then executes them in order
whenever you wish. No prior programming experience is necessary for
programming your HP-33E.
Why Write Programs?
Programs can save you time on repetitive calculations. Once you have
written the keystrokes procedure for solving a particular problem and
recorded it in the calculator, you no longer need to devote attention to
individual keystrokes that make up the procedure. You can let the
calculator solve each problem for you. You saw this earlier when we
computed the surface area of the moons of Jupiter.
And because you can easily check the procedure 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.
Keycodes
Set the PRGM-RUN switch prom[[[[Jllrun to PRGM. Press the first
keys [ (L AR Pren [9)(x7]) of the surface area of a sphere program
(refer to page 14) and the display will change to:
01-
15
0
The two-number code ©' 7 - that has appeared on the left side of the display
designates the line number of program memory that is being displayed.
The first digit denotes the row of the key. The second digit denotes the
number of the key in that row. Thus, the keycode 75 represents the key
in the first row on the calculator and the fifth key in that row: the
(9] key.
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