n Controlling Program Code in VB.NET

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Activity 1: Create the project framework
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Start up a new Visual Basic console project Use the name 5 for the project, and change the name of the default module from Module1 to CodeStructures Having done this, right click on the project entry in the Solution Explorer (5), select Properties from the Context menu and in the general section of the dialog box, change the Startup Object setting to CodeStructures (it will appear in the drop-down list) This project will house all of the activity exercises for this chapter The resulting code should appear as shown in Listing A52
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Module CodeStructures 'Activity subs go here ' Sub Main() 'Calls to Activity Subs go here ' End Sub End Module Listing A52: The module framework for these activities
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To test out this framework, add a simple sub to the module and call it from Sub Main(), eg Listing A53
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Module CodeStructures Sub Test() ConsoleWriteLine("Hello World!") End Sub s Sub Main() Test() End Sub End Module Listing A53: A sample activity sub and a call to it
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Once you have entered this code, execute the program (Debug/Start Without Debugging) and make sure it runs properly In subsequent activities, you will add other subs and change the statement in Sub Main() to call the ones you add Do not delete any existing sub when you add a new one
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Activity 2: Using IfThen structures
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The rst objective for this activity/exercise is to write a sub that will use an IfThen structure to differentiate between odd and even numbers The general form of the sub will be as shown in Listing A54
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Sub OddOrEven() Dim n As Integer ConsoleWrite("Enter a whole number: ") n = ConsoleReadLine() If <some condition> Then ConsoleWriteLine("{0} is even", n) Else ConsoleWriteLine("{0} is odd", n) End If End Sub Listing A54: Outline of a sub to distinguish between odd and even numbers
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Add the code for this sub to the module, and insert a call to the sub in place of the call to Test() inserted in Activity 1 Note that the IfThen statement is not correct as it stands, since we need to insert a suitable condition between If and Then There are several ways of formulating this condition, but the easiest will be to check whether the number n divides exactly by 2 If it does the number is even, if not, the number is odd It is possible to use the Mod operator to determine this
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Exercise A51
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Insert a condition into sub OddOrEven() that will evaluate to True if n is even, False if it is odd A suitable condition will use the Mod operator The next objective is to compose a condition that will differentiate between digits and non-digit characters We can determine if a Char type is a digit using a compound condition along the lines of:
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Ch >= "0" And Ch <= "9"
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Enter a new sub, coded as shown in Listing A55
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Sub CharOrDigit() Dim ch As Char ConsoleWrite("Enter a single character: ") ch = ConsoleReadLine() If <some condition> Then ConsoleWriteLine("A digit") Else ConsoleWriteLine("A non-digit") End If End Sub Listing A55: Outline for a sub to differentiate between alpha characters and digits
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Exercises A52
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1 Enter the code in Listing A54 and insert a suitable condition that will evaluate to True if ch is a digit 2 Insert a call to CharOrDigit in Main() and test its operation
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Activity 3: Using the Select Case structure
In this activity, we will use a Select Case structure to differentiate between various types of character Enter the following sub de nition (Listing A56) into the module:
Sub ClassifyChars() Dim ch As Char ConsoleWriteLine("Enter a single character") ch = ConsoleReadLine() Select Case ch Case "0" To "9" ConsoleWriteLine("A digit") Case "a" To "z" ConsoleWriteLine("A lower case letter") Case " ", "$", "a" ConsoleWriteLine("A currency symbol") Case Else ConsoleWriteLine("Unclassified") End Select End Sub Listing A56: A sub to classify single characters
Note that Select Case allows us to classify items from ranges and lists Currently the sub will differentiate between digits, lower case characters and currency symbols, with every other character type being unclassi ed