Answer the following statements true (T) or false (F)
1. When the button is clicked, the output of the following program will be
```
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim num As Integer = 20
DoubleIt(num)
txtBox.Text = CStr(num)
End Sub
Sub DoubleIt(ByRef var As Integer)
var = var * 2
End Sub
```
2. The value of an argument in a calling statement can be changed by a Sub procedure only if
the same name is used in the Sub procedure's parameter list.
3. Sub procedures can be individually tested before being placed into a program.
4. A value assigned to a variable in one part of a program always affects the value of the like-
named variable in the other parts of the program.
1. F
2. F
3. F
4. F
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