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CN2180 Chapter 1

CN2180 Chapter 1. Kemtis Kunanuraksapong MSIS with Distinction, A+ MCTS, MCDST, MCP. Agenda. Introduction to programming Basic Flow Chart Basic Pseudo code Introduction to WSH and VBScript Assignment. Introduction to programming. What is flowchart? Why we need it?

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CN2180 Chapter 1

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

  2. Agenda • Introduction to programming • Basic Flow Chart • Basic Pseudo code • Introduction to WSH and VBScript • Assignment

  3. Introduction to programming • What is flowchart? • Why we need it? • What does it look like?

  4. Basic flow chart • Start / Stop (End) • Process • Condition (Yes / No) • Input • Display

  5. Basic flow chart (cont.) Start How are you? input yes No =“good”? X = “Excellent!” X = “I’m sorry” ‘X’ Stop

  6. Basic Pseudo code • What is Pseudo code? • Why we need it? • What does it look like?

  7. Basic Pseudo code (Cont.) • Start • Ask user, “How are you” • Take input from user • If input = “good” then • X := “Excellent!” • Else • X := “I’m sorry” • Display “X” • Stop

  8. Exercise • Write a flow chart and pseudo code for • Grading system • Take input from user • Show A, if input is greater than or equal to 90

  9. Introduction to WSH • Windows Script Host (WSH) • Run on MS Windows • Small text based file • WSH Components • Script Engines • Script execution hosts • The WSH core object model • See Figure 1.5 on page 5

  10. WSH Scripting Engines • Script execution engine • VBScript • Jscript • 3rd party script engines such as Perl, Python, and Rexx.

  11. WSH Script Execution Host • CScript.exe • WScript.exe • Which one you should use? • Required user interaction?

  12. WSH Core Object Model • It provides VBScript with direct access to Windows resources • Windows desktop • Windows Start menu • Windows applications • Windows file system

  13. Object, Method, and Properties • What is an Object? • Object has method and properties • IE. Box is an object • Box’s method are put it in, take it out, re-arrange • Box’s properties are height, width, water resistance, etc

  14. First VBScript • Type : MsgBox “Hello World!” • Save it as hello.vbs • By default, windows use wscript.exe to execution host

  15. First VBScript (Cont.) • MsgBox() function is a built-in VBScript function • Modified the code to: Set WshShl = Wscript.CreateObject(“Wscript.Shell”) WshShl.Popup “Hello World!”

  16. First VBScript (Cont.) • Set is to define a variable named WshShl with a value Wscript.CreateObject(“Wscript.Shell”) • CreateObject method is used to instantiate the WshShell object. • Popup() method is to display a pop-up dialog

  17. First VBScript (Cont.) • Modified the code: WScript.Echo “Hello World” • Echo() method is to display a text message. • Tried with both WScript and CScript.

  18. Knock Knock Game • Designing the game: • Knock Knock! -> Who’s There • Panther -> Panther who? • Panther no panths, I’m going swimming • Error message should be displayed if answered wrong

  19. Knock Knock Game (Cont.) • Write pseudo code or draw flow chart • Do the code.

  20. Knock Knock Game (Cont.) Reply1 = InputBox(“Knock Knock!”) If Reply1 = “Who’s there?” Then Reply2 = InputBox(“Panther!”) If Reply2 = “Panther who?” Then MsgBox “Panther no panths I’m going swimming.” If Reply2 <> “Panther who?” Then MsgBox “Incorrect answer. Try again.” End if If Reply1 <> “Who’s there?” Then MsgBox “Incorrect answer. Try again.”

  21. Assignment • P29 Challenges #3 • Write a script to take input (name and grade) from user then use message box to show name, grade, and grade letter.

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