HP 40gs hp 40gs_user's guide_English_E_HDPMSG40E07A.pdf - Page 349

hp40g+.book Page 1 Friday, December 9, 2005 1:03 AM 21 Programming Introduction HINT This chapter describes how to program using the HP 40gs. 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. More information on programming, including examples and special tools, can be found at HP's calculators web site: http://www.hp.com/calculators The Contents of a Program Structured Programming An HP 40gs 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. Programming 21-1