Public Class Tester
Public Shared Sub Main
Dim result As New System.Text.StringBuilder
Dim a As ComplexNumber
Dim b As ComplexNumber
Dim c As ComplexNumber
a = New ComplexNumber(3, 4)
b = New ComplexNumber(5, -2)
c = a + b
result.AppendLine("Complex Numbers")
result.AppendLine("a = " & a.ToString())
result.AppendLine("b = " & b.ToString())
' ----- Addition.
c = a + b
result.AppendLine("a + b = " & c.ToString())
' ----- Subtraction.
c = a - b
result.AppendLine("a - b = " & c.ToString())
' ----- Multiplication.
c = a * b
result.AppendLine("a * b = " & c.ToString())
' ----- Division.
c = a / b
result.AppendLine("a / b = " & c.ToString())
' ----- Addition as assignment.
a += b
result.AppendLine("a += b ... a = " & a.ToString())
Console.WriteLine(result.ToString())
End Sub
End Class
Structure ComplexNumber
Public Real As Double
Public Imaginary As Double
Public Sub New(ByVal realPart As Double, ByVal imaginaryPart As Double)
Me.Real = realPart
Me.Imaginary = imaginaryPart
End Sub
Public Sub New(ByVal sourceNumber As ComplexNumber)
Me.Real = sourceNumber.Real
Me.Imaginary = sourceNumber.Imaginary
End Sub
Public Overrides Function ToString() As String
Return Real & "+" & Imaginary & "i"
End Function
Public Shared Operator +(ByVal a As ComplexNumber, _
ByVal b As ComplexNumber) As ComplexNumber
Return New ComplexNumber(a.Real + b.Real, a.Imaginary + b.Imaginary)
End Operator
Public Shared Operator -(ByVal a As ComplexNumber, _
ByVal b As ComplexNumber) As ComplexNumber
Return New ComplexNumber(a.Real - b.Real, a.Imaginary - b.Imaginary)
End Operator
Public Shared Operator *(ByVal a As ComplexNumber, _
ByVal b As ComplexNumber) As ComplexNumber
Return New ComplexNumber(a.Real * b.Real - a.Imaginary * b.Imaginary, _
a.Real * b.Imaginary + a.Imaginary * b.Real)
End Operator
Public Shared Operator /(ByVal a As ComplexNumber, _
ByVal b As ComplexNumber) As ComplexNumber
Return a * Reciprocal(b)
End Operator
Public Shared Function Reciprocal(ByVal a As ComplexNumber) As ComplexNumber
Dim divisor As Double
divisor = a.Real * a.Real + a.Imaginary * a.Imaginary
If (divisor = 0.0#) Then Throw New DivideByZeroException
Return New ComplexNumber(a.Real / divisor, -a.Imaginary / divisor)
End Function
End Structure
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