Інструкція Dim

Зміст

# Dim Statement

Declares variables or arrays.

If the variables are separated by commas - for example Dim v1, v2, v3 As String - first ones get defined as Variant variables. A new line, or colon sign (:), help separate variable definitions.

      Dim text As String
      Dim pv As com.sun.star.beans.PropertyValue, d As Date
      Dim Units as Integer : Dim EULER As Double

Dim declares local variables within subroutines. Global variables are declared with the Global, Public or the Private statement.

### Синтаксис:

    Dim variable [(start To end)] [As typename][, variable2[char] [(start To end)] [,...]]

New operator is optional when setting Option Compatible option.

### Параметри:

variable: Any variable or array name.

typename: Keyword that declares the data type of a variable.

Byte: Byte variable (0-255)

Boolean: Boolean variable (True, False)

Currency: Currency variable (Currency with 4 Decimal places)

Date: змінна дати

Double: Double-precision floating-point variable (1,79769313486232 x 10E308 - 4,94065645841247 x 10E-324)

Integer: ціла змінна (- 32768 - 32767)

Long: ціла змінна типу Long (-2 147 483 648 - 2 147 483 647)

Object: Object variable (Note: this variable can only subsequently be defined with Set!)

Single: змінна з рухомою комою звичайної точності ( 3,402823 x 10E38 - 1,401298 x 10E-45).

String: String variable consisting of a maximum of 2,147,483,647 characters.

Variant: Variant variable type (contains all types, specified by definition). If a type name is not specified, variables are automatically defined as Variant Type, unless a statement from DefBool to DefVar is used.

object: Universal Network object (UNO) object or ClassModule object instance.

char: Special character that declares the data type of a variable.

In LibreOffice Basic, you do not need to declare variables explicitly. However, you need to declare arrays before you can use them. You can declare a variable with the Dim statement, using commas (,) to separate multiple declarations. To declare a variable type, enter a type-declaration character following the name or use a corresponding type keyword name.

Declaration character | Variable type name
--- | ---
% | Integer
& | Long
! | Single
# | Double
$ | String
@ | Currency

array: Array declaration.

start, end: Numerical values or constants that define the number of elements (NumberElements=(end-start)+1) and the index range.

start and end can be numerical expressions if ReDim is applied at the procedure level.

LibreOffice Basic підтримує одно- і багатовимірні масиви, які визначаються за допомогою вказаного типу змінної. Масиви застосовують, якщо програма містить списки або таблиці, які потрібно змінювати. Перевага масивів полягає у тому, що можна звертатись до окремих елементів за індексами, які можуть бути сформульовані мов числові вирази або змінні.

Arrays are declared with the Dim statement. There are multiple ways to define the index range:

      Dim text(20) As String ' 21 elements numbered from 0 to 20
      Dim value(5 to 25) As Integer ' 21 values numbered from 5 to 25
      Dim amount(-15 to 5) As Currency ' 21 amounts (including 0), numbered from -15 to 5
      REM Two-dimensional data field
      Dim table$(20,2) ' 63 items; from 0 to 20 level 1, from 0 to 20 level 2 and from 0 to 20 level 3.

You can declare an array types as dynamic if a ReDim statement defines the number of dimensions in the subroutine or the function that contains the array. Generally, you can only define an array dimension once, and you cannot modify it. Within a subroutine, you can declare an array with ReDim. You can only define dimensions with numeric expressions. This ensures that the fields are only as large as necessary.

### Приклад:

    Sub ExampleDim1
    Dim sVar As String
    Dim iVar As Integer
        sVar = "Office"
    End Sub

    Sub ExampleDim2
      ' Двовимірне  поле даних
        Dim stext(20,2) As String
      Const sDim as String = " Розмірність:"
      For i = 0 To 20
        For ii = 0 To 2
            stext(i,ii) = str(i) & sDim & str(ii)
        Next ii
      Next i
      For i = 0 To 20
        For ii = 0 To 2
            MsgBox stext(i,ii)
        Next ii
      Next i
    End Sub

Пов'язані теми

New Operator

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