HP 49g Graphing Calculator - Manual (Page 188)

Introduction
This chapter describes how to create and nm programs on the HP 49G.
The HP 49G has a rich programming environment. Programs can range in
complexity from a simple task such as performing a sequence of
arithmetic operations, to a complex process that requests input, performs
extensive processing, and outputs results in a graphical fonnat.
This chapter focuses on creating aird running programs in algebraic mode
only. See the Advanced User’s Guide for infonnation on creating and
using programs in RPN mode. See the Pocket Gu ide for details of the
programming commands that are available.
Getting started
This section contains an example of how to create a simple program to
calculate the hypotenuse of a right-angle triangle, using Pythagoras’
theorem. When you start the program, you supply the known side lengths
as argiunents.
This program is an example of a simple algebraic calculation using the
arguments that you specify. Within the program, the calculation is
enclosed in single quotes (0O) to delimit it as an algebraic object. If you
need to do extensive processing involving looping and branching, you use
a nested procedure (0iE3) to delimit the procedure from the arguments.
The program does the following:
* It collects the known side lengths as arguments and stores them as
local variables, that is, variables that exist only while the program is
rimning.
® It uses the variables to calculate the length of the hypotenuse, and
returns the result to the history.
Create the program as follows:
1. Put the program delimiters on the command line.
0®
2. Define the two local variables to accept the arguments for the side
length.
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