What is the main difference between ByVal and ByRef? Where are they used in Visual Basic Programming? Explain your answers with examples.
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Choosing between
ByVal
andByRef
depends on whether you want the called function to have the ability to modify the original variable or not.Sub Main()
Dim message As String = “Hello”
AppendExclamationByVal(message)
Console.WriteLine(message) ‘ Output: Hello
End Sub
Sub AppendExclamationByVal(ByVal str As String)
str = str & “!”
End Sub
Sub Main()
Dim message As String = “Hello”
AppendExclamationByRef(message)
Console.WriteLine(message) ‘ Output: Hello!
End Sub
Sub AppendExclamationByRef(ByRef str As String)
str = str & “!”
End Sub