Public Class Calculator
    Implements ICalculator

    Public Function Add(ByVal a As Integer, ByVal b As Integer) As Integer _
       Implements ICalculator.Add

        Return (a + b)
    End Function

    Public Function Subtract(ByVal a As Integer, ByVal b As Integer) As Integer _
       Implements ICalculator.Subtract

        Return (a - b)
    End Function

    Public Function Multiply(ByVal a As Integer, ByVal b As Integer) As Integer _
       Implements ICalculator.Multiply

        Return (a * b)
    End Function

    Public Function Divide(ByVal a As Integer, ByVal b As Integer) As Integer _
       Implements ICalculator.Divide

        Return (a / b)
    End Function
End Class
