HP 40G manual Contents of a Program Structured Programming

15

Programming

Introduction

This chapter describes how to program using the HP 39G/

40G. In this chapter you’ll learn about:

•using the Program catalog to create and edit programs

•programming commands

•storing and retrieving variables in programs

•programming variables.

H I N T More information on programming, including examples and special tools, can be found at HP’s calculators web site:

www.hp.com/calculators

The Contents of a Program

Structured Programming

Example

An HP 39G/40G program contains a sequence of numbers, mathematical expressions, and commands that execute automatically to perform a task.

These items are separated by a colon ( : ). Commands that take multiple arguments have those arguments separated by a semicolon ( ; ). For example,

PIXON xposition;yposition:

Inside a program you can use branching structures to control the execution flow. You can take advantage of structured programming by creating building-block programs. Each building-block program stands alone—and it can be called from other programs. Note: If a program has a space in its name then you have to put quotes around it when you want to run it.

RUN GETVALUE: RUN CALCULATE: RUN "SHOW ANSWER":

This program is separated into three main tasks, each an individual program. Within each program, the task can be simple—or it can be divided further into other programs that perform smaller tasks.

Programming 15-1