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Programming 229

Programming

Introduction

This chapter describes how to program the HP 39gII. In

this chapter you’ll learn about:

• programming commands

• writing functions in programs

• using variables in programs

• executing programs

• debugging programs

• creating programs for building custom apps

• sending a program to another HP39gII

HP 39gII

Programs

An HP 39gII program contains a sequence of commands

that execute automatically to perform a task.

Command

Structure

Commands are separated by a semicolon ( ; ).

Commands that take multiple arguments have those

arguments enclosed in parentheses and separated by a

comma( , ). For example,

PIXON (xposition, yposition);

Sometimes, arguments to a command are optional. If an

argument is omitted, a default value is used in its place.

In the case of the PIXON command, a third argument

could be used that specifies the color of the pixel:

PIXON (xposition, yposition [ , color]);

The last argument indicates which of four colors to use

when lighting up the pixel. Here, the default value is 0

(black). In this manual, optional arguments to commands

appear inside square brackets, as shown above. In the

PIXON example, a graphic variable (G) could be

HP 39gII User Manual

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