In Visual Basic, which of the following keyword tells the computer to pass the variable’s address rather than its contents?

[amp_mcq option1=”ByAdd” option2=”ByPoint” option3=”ByRef” option4=”ByVal” correct=”option2″]

The correct answer is ByRef.

• ByVal passes a copy of the variable’s value to the called procedure.
• ByRef passes the variable’s address to the called procedure. This means that any changes made to the variable in the called procedure will be reflected in the calling procedure.
• ByAdd is not a valid keyword in Visual Basic.
• ByPoint is a valid keyword in Visual Basic, but it is used to pass a point structure to a procedure. A point structure is a data type that stores two values, representing the x- and y-coordinates of a point.

Here is an example of how to use the ByRef keyword:

“`
Sub ChangeMe(ByRef x As Integer)
x = x + 1
End Sub

Dim i As Integer
i = 1
ChangeMe(i)
‘ i is now 2
“`

In this example, the variable i is passed by reference to the ChangeMe procedure. This means that any changes made to i in the ChangeMe procedure will be reflected in the calling procedure. In this case, the value of i is increased by 1 in the ChangeMe procedure, and the value of i in the calling procedure is also increased by 1.