Private Sub Power(ByVal num As Integer) DebugWriteLine( (num ^ 2)ToString ) End Sub in Java

Decoder Data Matrix in Java Private Sub Power(ByVal num As Integer) DebugWriteLine( (num ^ 2)ToString ) End Sub

Private Sub Power(ByVal num As Integer) DebugWriteLine( (num ^ 2)ToString ) End Sub
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Suppose you tried to call the Power procedure with no arguments, as shown here:
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Power()
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In this case, the compiler would complain, Argument not specified for the parameter num of Private Sub Power(num As Integer) Similarly, suppose you tried to call the Power procedure with more than one argument, as shown here:
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Power(5, 3)
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This time, the compiler would complain, Too many arguments to Private Sub Power(num As Integer) The argument passed also must be the same data type specified in the procedure s declaration For example, try to call the Power subroutine with code (presumably inside an event procedure) as follows:
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Dim strInput As String strInput = InputBox("Enter a number") Power(strInput)
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You are passing the correct number of arguments, one Nevertheless, if Option Strict is on as I recommended in 5, the compiler would complain, Option Strict On disallows implicit conversions from String to Integer The reason is that the expected data type of the argument is an Integer, not a String Therefore, the call would have to be rewritten as follows:
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Power(IntegerParse(strInput))
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ByVal vs ByRef So far any arguments in the code examples have been preceded by the ByVal attribute This section will illustrate the difference between the ByVal and ByRef attributes First, rewrite the Power function and the Click event procedure of the form to read as follows:
Private Sub Power(ByVal num As Integer) DebugWriteLine _ ("In Power num starts at " & numToString) num = num ^ 2 DebugWriteLine _ ("After num = num ^ 2 num = " & numToString) End Sub Private Sub Form1_Click(ByVal sender As Object, _ ByVal e As SystemEventArgs) Handles MeClick Dim x As Integer = 5 DebugWriteLine _ ("Before calling Power x = " & xToString)
Organizing Your Code with Procedures
Power(x) DebugWriteLine _ ("After calling Power x = " & xToString) End Sub
Run the application The output would be the following:
Before calling Power x = 5 In Power num starts at 5 After num = num ^ 2 num = 25 After calling Power x = 5
As the output demonstrates, although the value of the parameter num in the called procedure (Power) changed, the value of the corresponding argument x in the calling procedure (Click event of the form) did not In other words, when a parameter has the ByVal attribute, any change to the value of the parameter in the called procedure does not affect the value of the corresponding argument in the calling procedure Stop the application and make one change to the code, changing the attribute of the parameter in the Power subroutine from ByVal to ByRef The code now should read as follows:
Private Sub Form1_Click(ByVal sender As Object, _ ByVal e As SystemEventArgs) Handles MeClick Dim x As Integer = 5 DebugWriteLine _ ("Before calling Power x = " & xToString) Power(x) DebugWriteLine _ ("After calling Power x = " & xToString) End Sub Private Sub Power(ByRef num As Integer) DebugWriteLine _ ("In Power num starts at " & numToString) num = num ^ 2 DebugWriteLine _ ("After num = num ^ 2 num = " & numToString) End Sub
Run the application The output would be the following:
Before calling Power x = 5 In Power num starts at 5 After num = num ^ 2 num = 25 After calling Power x = 25
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As the output demonstrates, when the value of the parameter num in the called procedure (Power) changed, the value of the corresponding argument x in the calling procedure (Click event of the form) also changed In other words, when a parameter has the ByRef attribute, any change to the value of the parameter in the called procedure does affect the value of the corresponding argument in the calling procedure Normally you will use the ByVal attribute, which is the default However, which attribute you use simply depends on what you are trying to accomplish
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