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CN2180 Chapter 4

CN2180 Chapter 4. Kemtis Kunanuraksapong MSIS with Distinction, A+ MCTS, MCDST, MCP. Agenda. Constants, Variables, Arrays, and Dictionaries. The Story of Captain Adventure Assignment Quiz. How data is defined. Three ways to define or declare variable Const Dim Redim. Constant.

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CN2180 Chapter 4

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  1. CN2180Chapter 4 Kemtis Kunanuraksapong MSIS with Distinction, A+ MCTS, MCDST, MCP

  2. Agenda • Constants, Variables, Arrays, and Dictionaries. • The Story of Captain Adventure • Assignment • Quiz

  3. How data is defined • Three ways to define or declare variable • Const • Dim • Redim

  4. Constant • User defined • Built-in • vbTab • vbCrlf

  5. Assigning Data to Constants [public | private] Const ConstName = Expression • See Table 4.3 on Page 84 • See MsgFormatter.vbs on Page 84

  6. VBScript Data Types • There are only one type called a variant • Boolean • Date • String • See table 4.4 on Page 90

  7. Defining Variables • Dim variable name • Assign a value • Option Explicit • See BigBadWolf.vbs on Page 92

  8. Variable Naming Rules • Less than 256 characters long • Must begin with an alphabetic character • Only letters, numbers, and _ allowed • Reserved words cannot be used • Space is not allowed • Must be unique

  9. Hungarian Notation • Add three characters in front of variable name • Date = dtm • Error = err • Object = obj • String = str • See Page 95

  10. Modifying Variable Values • Dim strMyName • strMyName = “Kemtis” • strMyName = “Kunanuraksapong

  11. Arithmetic Operations • See MathDemo.vbs on Page 97

  12. Order of Precedence • ^ - Exponential • - - Negation • * - Multiplication • / - Division • \ - Integer division • Mod - Modulus • + - Addition • - - Subtraction

  13. Environment Variables • What is environment variables? • TEMP • TMP • See ComputerAnalyzer.vbs on Page 101

  14. A collections of related data • Array • Index • Value Dim ArrayName(dimensions) Dim ArrayName(dimensions,dimensions)

  15. Processing Array Contents For Each element In group Statements…. Next [Element] See ArrayDemo.vbs on Page 106

  16. Getting a handle on the size • Ubound() • Lbound()

  17. Resizing Arrays • Dim astrMyArray () • RedimastrMyArray (10) • Redim Preserve astrMyArray(20) • See ResizeArray.vbs on Page 110

  18. Erasing Array • Erase ArrayName

  19. Dictionaries • Just like Array • Define own pair of key and value • Three properties • Count (Return number of object) • Item (Get or Add an item) • Key (Add new key)

  20. Dictionaries (Cont.) Dictionaries method • Add (Add key/item) • Exists (Boolean / True if exist) • Items (Return all Items) • Keys (Return keys) • Remove (Delete a key/item pair) • Remove All (Remove all key/item pairs)

  21. Work with Dictionary Dim dictObject Set dictObject = CreateObject(“Scripting.Dictionary”) dictObject.Add “Model1555”,”Red Bike” dictObject.Add “Model1888”,”Blue Bike” dictObject.Item(“Model1999”) = “Green Bike” If dictObject.Exists(“Model1555”) = true then _ msgbox “Model 1555 is a “ & dictObject.Item(“Model1555”) dictObject.Remove “Model1555” dictObject.removeall

  22. Parsing Arguments • Must run with cscript.exe cscript displayargs.vbs tic tac toe cscript displayargs.vbs tic “super tac” toe • See ArgumentProcessor.vbs on Page 116

  23. Captain Adventure game • Beginning the captain Adventure script • Setting up Constants and Variables • Creating a splash Screen • Collecting User Input • Assembling and Displaying the story

  24. Assignment • Challenge #1 Add 2 more user input and adding more story to the story line. • Challenge #2 Use an Array to store the user input collected instead.

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