VB.Net/Class/Operator Overload

Operator Overload Demo

Imports System
Public Class MainClass
    Shared Sub Main(ByVal args As String())
        Dim X, Y As Complex
        X = New Complex(1, 2)
        Y = New Complex(3, 4)
        Console.WriteLine( (X + Y).ToString )
        Console.WriteLine( (X - Y).ToString )
        Console.WriteLine( (X * Y).ToString )
        Console.WriteLine( (X = Y).ToString )
        Console.WriteLine( (X <> Y).ToString )
        Console.WriteLine( (-X).ToString )
        Dim abs_x As Double = CDbl(X)
        Console.WriteLine(  abs_x.ToString )
    End Sub
End Class
Public Class Complex
    Public realPart As Double
    Public imaginaryPart As Double
    " Constructors.
    Public Sub New()
    End Sub
    Public Sub New(ByVal real_part As Double, ByVal imaginary_part As Double)
        realPart = real_part
        imaginaryPart = imaginary_part
    End Sub
    " ToString.
    Public Overrides Function ToString() As String
        Return realPart.ToString & " + " & imaginaryPart.ToString & "i"
    End Function
    " Operators.
    Public Shared Operator *(ByVal c1 As Complex, ByVal c2 As Complex) As Complex
        Return New Complex( _
            c1.realPart * c2.realPart - c1.imaginaryPart * c2.imaginaryPart, _
            c1.realPart * c2.imaginaryPart + c1.imaginaryPart * c2.realPart)
    End Operator
    Public Shared Operator +(ByVal c1 As Complex, ByVal c2 As Complex) As Complex
        Return New Complex( _
            c1.realPart + c2.realPart, _
            c1.imaginaryPart + c2.imaginaryPart)
    End Operator
    Public Shared Operator -(ByVal c1 As Complex, ByVal c2 As Complex) As Complex
        Return New Complex( _
            c1.realPart - c2.realPart, _
            c1.imaginaryPart - c2.imaginaryPart)
    End Operator
    Public Shared Operator =(ByVal c1 As Complex, ByVal c2 As Complex) As Boolean
        Return (c1.realPart = c2.realPart) AndAlso (c1.imaginaryPart = c2.imaginaryPart)
    End Operator
    Public Shared Operator <>(ByVal c1 As Complex, ByVal c2 As Complex) As Boolean
        Return (c1.realPart <> c2.realPart) OrElse (c1.imaginaryPart <> c2.imaginaryPart)
    End Operator
    Public Shared Operator -(ByVal c1 As Complex) As Complex
        Return New Complex(c1.imaginaryPart, c1.realPart)
    End Operator
    Public Shared Narrowing Operator CType(ByVal c1 As Complex) As Double
        Return System.Math.Sqrt(c1.realPart * c1.realPart + c1.imaginaryPart * c1.imaginaryPart)
    End Operator
End Class