HP Prime Graphing Wireless Calculator Instrukcja Użytkownika Pobierz pdf (Strona 600)

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28 Programming in HP PPL

This chapter describes the HP Prime Programming Language (HP PPL). In this chapter you’ll learn about:

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programming commands

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writing functions in programs

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using variables in programs

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executing programs

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debugging programs

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creating programs for building custom apps

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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 species 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 specied as the rst 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]);

Some built-in commands employ an alternative syntax whereby function arguments do not appear in

parentheses. Examples include RETURN and RANDOM.

Program Structure

Programs can contain any number of subroutines (each of which is a function or procedure). Subroutines start

with a heading consisting of the name, followed by parentheses that contain a list of parameters or

arguments, separated by commas. The body of a subroutine is a sequence of statements enclosed within a

BEGIN–END; pair. For example, the body of a simple program, called MYPROGRAM, could look like this:

EXPORT MYPROGAM()

BEGIN

PIXON(1,1);

END;

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