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Logical Operators Operators Logical operators allow you to do operations on elements according to the rules of Boolean algebra. If the operators are applied to Boolean values, the operation provides the result required directly. If used in conjunction with integer and long integer values, the operation is done at the bit level. AND And operator OR Or operator XOR Exclusive Or operator NOT Negation EQV Equivalent test (both parts True or False) IMP Implication (if the first expression is true, then the second must also be true) Comparison Operators Comparison operators can be applied to all elementary variable types (numbers, date details, strings, and Boolean values). = Equality of numbers, date values and strings Inequality of numbers, date values and strings > Greater than check for numbers, date values and strings >= Greater than or equal to check for numbers, date values and strings < Less than check for numbers, date values and strings 3 Then B = 2 End If The B = 2 assignment only occurs when value of variable A is greater than three. A variation of the If statement is the If/Else clause: If A > 3 Then B = 2 Else Chapter 2 · The Language of OpenOffice.org BASIC 23
Branching B = 0 End If In this example, the variable B is assigned the value of 2 when A is greater than 3, otherwise B is assigned the value of 0. For more complex statements, you can cascade the If statement, for example: If A = 0 Then B = 0 ElseIf A < 3 Then B = 1 Else B = 2 End If If the value of variable A equals zero, B is assigned the value 0. If A is less than 3 (but not equal to zero), then B is assigned the value 1. In all other instances (that is, if A is greater than or equal to 3), B is assigned the value 2. A complete If statement may be written on a single line, with a simpler syntax. The first example of this page may be written as: If A > 3 Then B = 2 The second example of this page may be written as: If A > 3 Then B = 2 Else B = 0 Select...Case The Select...Case instruction is an alternative to the cascaded If statement and is used when you need to check a value against various conditions: Select Case DayOfWeek Case 1: NameOfWeekday = "Sunday" Case 2: NameOfWeekday = "Monday" Case 3: NameOfWeekday = "Tuesday" Case 4: NameOfWeekday = "Wednesday" Case 5: NameOfWeekday = "Thursday" Case 6: NameOfWeekday = "Friday" Case 7: NameOfWeekday = "Saturday" End Select In this example, the name of a weekday corresponds to a number, so that the DayOfWeek variable is assigned the value of 1 for Sunday, 2 for Monday value, and so on. The Select command is not restricted to simple 1:1 assignments — you can also specify comparison operators or lists of expressions in a Case branch. The following example lists the most important syntax variants: Select Case Var Case 1 To 5 ' ... Var is between the numbers 1 and 5 (including the values 1 and 5). Case > 100 ' ... Var is greater than 100 Case 6, 7, 8 ' ... Var is 6, 7 or 8 Case 6, 7, 8, > 15, < 0 ' ... Var is 6, 7, 8, greater than 15, or less than 0 Case Else ' ... all other instances End Select Now consider a misleading (advanced) example, and a common error: Select Case Var Case Var = 8 ' ... Var is 0 24 OpenOffice.org 3.2 BASIC Guide · March 2010
Page 1 and 2: OpenOffice.org 3.2 BASIC Guide
Page 3 and 4: 3 1 2 3 4 Contents Copyright.......
Page 5 and 6: Preface This guide provides an intr
Page 7 and 8: About OpenOffice.org Basic and allo
Page 9 and 10: Overview of a Basic Program In addi
Page 11 and 12: Working With Variables example, in
Page 13 and 14: Numbers with long integer variables
Page 15 and 16: Numbers return incorrect values. Th
Page 17 and 18: Arrays Dim MyInteger(3) creates 4 i
Page 19 and 20: Scope and Life Span of Variables Sc
Page 21: Constants Const A = 10 You can also
Page 25 and 26: Loops use an explicit counter like
Page 27 and 28: Procedures and Functions ' ... here
Page 29 and 30: Procedures and Functions The exampl
Page 31 and 32: Error Handling The following code i
Page 33 and 34: Other Instructions End Sub & "Text:
Page 35 and 36: Conversion Functions calculates the
Page 37 and 38: Conversion Functions IsBoolean = Fa
Page 39 and 40: Strings Formatting Strings The Form
Page 41 and 42: Date and Time The Weekday function
Page 43 and 44: Files and Directories Note - VBA :
Page 45 and 46: Files and Directories The FreeFile
Page 47 and 48: Message and Input Boxes Display of
Page 49 and 50: Other Functions specifies the same
Page 51 and 52: Universal Network Objects (UNO) com
Page 53 and 54: Tools for Working with UNO The foll
Page 55 and 56: Overview of Central Interfaces basi
Page 57 and 58: 5 C H A P T E R 5 5 Working with
Page 59 and 60: XML File Format The StarDesktop Ope
Page 61 and 62: The StarDesktop The FileProperties
Page 63 and 64: The options of the print method The
Page 65 and 66: Doc = ThisComponent StyleFamilies =
Page 67 and 68: 6 C H A P T E R 6 6 Text Documen
Page 69 and 70: described in Search and Replace. Th
Page 71 and 72: Paragraph Properties The Structure
Page 73 and 74:
If TextElement.supportsService("com
Page 75 and 76:
isEndOfSentence () returns True if
Page 77 and 78:
Doc.Text.insertControlCharacter(Cur
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Dim Replace As Object Dim BritishWo
Page 81 and 82:
More Than Just Text Note - Text tab
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Doc.Text.insertTextContent(Cursor,
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frame objects are set to the starti
Page 87 and 88:
The following example shows how the
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7 C H A P T E R 7 7 Spreadsheet
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The same interface provides methods
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Cell = Sheet.getCellByPosition(0, 0
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StartColumn (long) first column in
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You can apply all of the named prop
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NumberFormatId = NumberFormats.addN
Page 101 and 102:
ShadowFormat (struct) The Structure
Page 103 and 104:
FooterBottomBorderDistance (long) d
Page 105 and 106:
Definition of Elements to be Printe
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VARP variance based on the total po
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8 C H A P T E R 8 8 Drawings and
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Doc = ThisComponent Page = Doc.Draw
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RectangleShape.Position = Point Rec
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The lines are dark gray (Color) and
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service. Dim Doc As Object Dim Page
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An Overview of Various Drawing Obje
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Page.add(LineShape) Polypolygon Sha
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AdjustBlue (Short) blue value as a
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Point.x = 1000 Point.y = 1000 Size.
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Pause (long) the amount of time tha
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Using Charts in Spreadsheets The pr
Page 131 and 132:
The Structure of Charts com.sun.sta
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The Structure of Charts Min (Double
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The Structure of Charts HasZAxisGri
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The Structure of Charts The followi
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10 C H A P T E R 1 0 10 Database
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User (String) user name Password (S
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Dim Statement As Object Dim ResultS
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FORWARD_ONLY ResultSet only permits
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11 C H A P T E R 1 1 11 Dialogs
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Closing With the Close Button in th
Page 151 and 152:
Multi-Page Dialogs Properties A dia
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Control element-specific events: Ev
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Buttons (short) X (long) Y (long) b
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Temporary (Boolean) the focus is te
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Model.Label (String) label that is
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Model.HScroll (Boolean) the text ha
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12 C H A P T E R 1 2 12 Forms In
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Accessing the View of Control Eleme
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Tag (String) Control Element Forms
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Enabled (Boolean) the control eleme
Page 171 and 172:
LineCount (Short) number of lines o
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