Denso BHT-200QW Especificaciones descargar pdf (Pagina 79)

100

101

Chapter 5. Data Types

5.5 Scope of Variables

You may scope work variables and register variables to be local or global with the PRIVATE

or GLOBAL statement, respectively.

(1) Global variables

A global variable can be accessed by any routine in source files to share information

between those routines. Before access to it, you need to declare it with the GLOBAL

statement.

(2) Local variables

A local variable can only be accessed by any routine in a source file where it is

defined.

Before access to it, you need to declare it with the PRIVATE statement.

(3) Variables not declared to be global or local

If not declared to be global or local, a variable is closed in each file where it is defined.

A variable used inside the FUNCTION or SUB function without declaration is available

only within a function where it is defined.

You may also share variables between user programs when one program chains to another

by declaring variables to be common with the COMMON statement.

5.5.1 Global Variables

A global variable can be shared between source files in a program. In each file where you

want to use a particular global variable, write GLOBAL preceding a desired variable name or

DEFREG statement.

(Example) GLOBAL aaa%

GLOBAL bbb$[10]

GLOBAL ccc$(5,3)[30]

GLOBAL DEFREG ddd

GLOBAL DEFREG eee%(5)

(Example 1) To share the variable aa% between Files 1 and 2, define aa% by using the

GLOBAL statement in each file as follows:

File 1

GLOBAL aa%

File 2

GLOBAL aa%

Before access to a global variable, you should define it.

1 2 ... 74 75 76 77 78 79 80 81 82 83 84 ... 586 587

Comentarios a estos manuales

Sin comentarios

Denso BHT-200QW Especificaciones Pagina 79

Comentarios a estos manuales

Relacionado con productos y manuales para Lectores De Códigos De Barras Denso BHT-200QW