Epson RC170 Guia do Utilizador descarregar pdf (Página 172)

6. The SPEL+ Language

6.7 Working with variables

6.7.1 Variable scopes

There are three different scopes for variables in SPEL

- Local

- Module

- Global

6.7.2 Local variables

Local variables are available to all statements in the same function. Functions using local

variable names can not refer to the same local variables in other functions. This is why

they are called locals, because they are local to the function they are being used in.

To declare local variables in a function, use one of the variable declaration instructions at

the beginning of the function after the Function statement:

Boolean, Byte, Integer, Long, Real, Double, String

For example, the following function declares several local variables:

Function test

Integer intVar1, intVar2

Real realVar

String dataStr$

Integer array(10)

.....

Fend

6.7.3 Module variables

Module variables are available to all functions in the same program file.

To declare module variables in a program, use one of the variable declaration instructions

at the beginning of the program before any Function statements:

Boolean, Byte, Integer, Long, Real, Double, String

One way to indicate that a variable is module level is to precede the name with "m_", as

shown in the example below.

For example, the following function declares several module level variables:

' Module level vars, used by all functions in this file

Integer m_IntVar1, m_IntVar2

Real m_RealVar

String m_DataStr$

Integer m_Array(10)

Function main

m_IntVar1 = 25

Call test

Fend

Function test

Print m_IntVar1

Fend

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