Chapter 41 General Procedures Sub Procedures, Part I Sub Procedures, Part II Function Procedures.

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Presentation transcript:

Chapter 41 General Procedures Sub Procedures, Part I Sub Procedures, Part II Function Procedures

Chapter 42 Sub Procedures, Part I Sub Procedures Variables and Expressions as Arguments Calling Other Sub Procedures

Chapter 43 Devices for modularity Visual Basic has two devices for breaking problems into smaller pieces: Sub procedures Function procedures

Chapter 44 Sub Procedures Perform one or more related tasks General syntax Sub ProcedureName() statements End Sub

Chapter 45 Calling a Sub procedure The statement that invokes a Sub procedure is also referred to as a call statement. A call statement looks like this: ProcedureName()

Chapter 46 Naming Sub procedures The rules for naming Sub procedures are the same as the rules for naming variables.

Chapter 47 Sub ExplainPurpose() Lab sheet 4.2: Code lstBox.Items.Clear() ExplainPurpose() lstBox.Items.Add("") lstBox.Items.Add("Program displays a sentence") lstBox.Items.Add("identifying a sum.") End Sub

Chapter 48 Passing Values You can send values to a Sub procedure Sum(2, 3) Sub Sum(ByVal num1 As Double, ByVal num2 As Double) lstBox.Items.Add("The sum of " & num1 & " and " _ & num2 & " is " & (num1 + num2) & "." End Sub In the Sum Sub procedure, 2 will be stored in num1 and 3 will be stored in num2

Chapter 49 Arguments and Parameters Sum(2, 3) Sub Sum(ByVal num1 As Double, ByVal num2 As Double) arguments parameters displayed automatically

Chapter 410 Several Calling Statements ExplainPurpose() Sum(2, 3) Sum(4, 6) Sum(7, 8) Output: Program displays a sentence identifying a sum. The sum of 2 and 3 is 5. The sum of 4 and 6 is 10 The sum of 7 and 8 is 15.