HP Prime Graphing Calculator - Manual (Page 503)

Programming in HP PPL 497
27
Programming in HP PPL
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
HP Prime
Programs
An HP Prime 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]);
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]);