Simple Programming - HP -32S Owner's Manual

5
Simple Programming
Part 1 of this manual introduced you to functions and operations that
you can use manually, that is, by pressing a key for each individual
operation. A program lets you repeat operations or calculations with
out repeating the keystrokes. In this chapter you will learn how to
program a series of operations to occur automatically. In the next
chapter, 'Programming Techniques,' you will learn about subroutines
and conditional instructions.
Introduction: A Simple Programming Example. To find the area
of a circle with a radius of 5, you would use the formula A = tt2 and
press
5 I S 1 0 0
to get the result for this circle, 78.5398.
But what if you wanted to find the area of many different circles?
Rather than repeat the given keystrokes each time (varying only the
*5' for the different radii), you can put the repeatable keystrokes into
a program:
001 *2
002 tr
003 x
This very simple program assumes that the value for the radius is in
the X-register (the display) when the program starts to run. It com
putes the area and leaves it in the X-regjster.
70 5: Simple Programming