HP Prime Graphing NW280AAABA manual Programming in HP PPL, HP Prime Programs Command Structure

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Programming in HP PPL

HP Prime Programs

Command Structure

This chapter describes the HP Prime Programming Language (HP PPL). 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 HP Prime

An HP Prime program contains a sequence of commands that execute automatically to perform a task.

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]);

In this manual, optional arguments to commands appear inside square brackets, as shown above. In the PIXON example, a graphics variable (G) could be specified as the first argument. The default is G0, which always contains the currently displayed screen. Thus, the full syntax for the PIXON command is:

PIXON([G,] xposition, yposition [ ,color]);

Programming in HP PPL 497