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Com 211 Oobasic Theory Book UNESCO-NIGERIA TECHNICAL & VOCATIONAL EDUCATION REVITALISATION PROJECT-PHASE II NATIONAL DIPLOMA IN COMPUTER TECHNOLOGY OOBASIC/VISUAL BASIC PROGRAMMING COURSE CODE: COM 211 YEAR I SEMESTER II THEORY Version 1: December ,2008 Table Of Contents WEEK 1 Concept of programming .................................................................................................. 4 Systems Development Cycle ............................................................................................ 4 How windows work .......................................................................................................... 5 WEEK 2 The Visual Basic environment .......................................................................................... 5 Starting Visual Basic ........................................................................................................ 7 Stopping Visual Basic ...................................................................................................... 8 Getting online help ........................................................................................................... 8 Opening Application...................................................................................................... 12 Creating Simple application ( Wizard ) ........................................................................... 12 Running your application ................................................................................................ 18 Creating Executable File ................................................................................................. 19 Saving your application .................................................................................................. 20 VB Character set ............................................................................................................ 22 Relational Operators ....................................................................................................... 22 Arithmetic Operators ..................................................................................................... 22 Blank character ............................................................................................................... 22 Data Types ..................................................................................................................... 22 WEEK 3 Declaring Variables ........................................................................................................ 26 Assigning Values to Variables ........................................................................................ 28 Mathematical Expressions .............................................................................................. 30 Conditional Operators ..................................................................................................... 33 WEEK 4 Properties of the Form .................................................................................................... 34 Intrinsic Controls ............................................................................................................ 37 Label control .................................................................................................................. 38 Text Box ........................................................................................................................ 40 Focus In on Controls ...................................................................................................... 42 The Command Button .................................................................................................... 42 The PictureBox Control .................................................................................................. 44 The Image Control .......................................................................................................... 46 WEEK 5 Creating non-wizard applications.................................................................................... 47 Adding Controls to applications ...................................................................................... 47 Managing Controls ........................................................................................................ 48 Change the control properties ......................................................................................... 48 Handling Control Event .................................................................................................. 57 Writing Code ................................................................................................................. 63 WEEK 6 If...Then...Else Statement ................................................................................................ 65 Select Case Statement ..................................................................................................... 67 OptionButton Control ..................................................................................................... 69 CheckBox Control .......................................................................................................... 72 Frame Control ................................................................................................................ 78 WEEK 7 Do...Loop Statement ....................................................................................................... 80 For...Next Statement ....................................................................................................... 81 Sub Statement................................................................................................................. 84 WEEK 8 Supplied Numeric Functions (Math Functions ) .............................................................. 88 Abs Function .................................................................................................................. 88 Int Functions .................................................................................................................. 88 Rnd Function .................................................................................................................. 89 Sqr Function ................................................................................................................... 90 Supplied String Function ................................................................................................ 90 Len Function .................................................................................................................. 90 2 LCase and Functions ...................................................................................................... 91 UCase Function .............................................................................................................. 91 Asc Function .................................................................................................................. 92 Chr Function .................................................................................................................. 92 Supplied Time And Date Functions ................................................................................ 93 Now Function ................................................................................................................. 93 Date Function ................................................................................................................. 93 Time Function ................................................................................................................ 93 WEEK 9Non-Arrays data values .................................................................................................. 94 Arrays data values .......................................................................................................... 94 Declaring Fixed-Size Arrays ........................................................................................... 95 Multidimensional Arrays ................................................................................................ 97 WEEK 10List Boxes Controls That Work Like Arrays ................................................................... 99 List Boxes: Controls That Work Like Arrays ................................................................ 109 WEEK 11 Combo Boxes ............................................................................................................... 117 The Timer Control ........................................................................................................ 122 Scrolling the Scroll Bars ............................................................................................... 124 WEEK 12 MsgBox Function ......................................................................................................... 128 InputBox Function ........................................................................................................ 131 WEEK 13 The Basic Elements of a Database ................................................................................ 133 WEEK 14 Using Data Control ....................................................................................................... 134 Data Access Objects (DAO) ......................................................................................... 136 Visual Basic Wizard ..................................................................................................... 137 Data Form Wizard .......................................................................................................
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