Hp 48g Graphing Calculator Manual de usuario descargar pdf (Pagina 422)

100

101

Using Local Variables

There are disadvantages to using global variables in programs:

■ After program execution, global variables that you no longer need

to use must be purged if you want to clear the VAR menu and free

user memory.

■ You must explicitly store data in global variables prior to program

execution, or have the program execute STO.

Local variables address the disadvantages of global variables in

programs. Local variables are temporary variables created by a

program. They exist only while the program is being executed and

cannot be used outside the program. They never appear in the VAR

menu. In addition, local variables are accessed faster than global

variables. (By convention, this manual uses lowercase names for local

variables.)

Creating Local Variables

In a program, a local variable structure creates local variables.

To enter a local warlable structyre ¡n a program:

1. Enter the command (press

2. Enter one or more variable names.

3. Enter a defining procedure (an algebraic or program object) that

uses the names.

narnei iiame2

namei name2

namCn ' algebraic '

namcn V. program

When the command is executed in a program, n values are taken

from the stack and assigned to variables namei, name2, ■ .. name^.

For example, if the stack looks like this;

29-16 Programming the HP 48

1 2 ... 417 418 419 420 421 422 423 424 425 426 427 ... 611 612

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Hp 48g Graphing Calculator Manual de usuario Pagina 422

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