' Visual Basic 2008 9.0 .NET Examples - Floating Point Notation - Single Double Decimal - Introduction to Visual Basic : 
Module Example1
    Sub Main()
        Dim units As Single() = _
           {500, 200, 100, 50, 20, 10, 5, 2, 1, 0.5, 0.2, 0.1, 0.05, 0.02, 0.01}
        '
        Dim amount As Single = 0.06
        Console.Write(amount & " : ")
        '
        Dim index As Integer
        Do While amount > 0
            Do While amount - units(index) >= 0
                Console.Write(units(index) & " ")
                amount -= units(index)
            Loop
            index += 1
        Loop
        Console.WriteLine()
        '
        Console.ReadLine()
    End Sub
End Module
Module Example2
    Sub Main()
        Console.WriteLine(2.0 Mod 0.2 = 0)
        Console.WriteLine(2.0 Mod 0.2)
        '
        Dim someSingle As Single = 4.99
        Console.WriteLine(someSingle * 17 = 84.83)
        Console.WriteLine(someSingle * 17)
        '
        someSingle = 1 / 107.0
        Console.WriteLine(someSingle * 107 = 1)
        Console.WriteLine(someSingle * 107)
        '
        Console.ReadLine()
    End Sub
End Module
Module Example3
    Public Sub Main()
        Console.WriteLine("seeeeeeeemmmmmmmmmmmmmmmmmmmmmmm")
        Console.WriteLine(GetBinary(1.17549435E-38F) & " : " & _
                          1.17549435E-38F.ToString())
        Console.WriteLine(GetBinary(0.5F) & " : " & 0.5F.ToString())
        Console.WriteLine(GetBinary(0.6F) & " : " & 0.6F.ToString())
        Console.WriteLine(GetBinary(Single.MaxValue) & " : " & _
                          Single.MaxValue.ToString())
        Console.WriteLine(GetBinary(-1.17549435E-38F) & " : " & _
                          -1.17549435E-38F.ToString())
        Console.WriteLine(GetBinary(Single.MinValue) & " : " & _
                          Single.MinValue.ToString())
        Console.WriteLine(GetBinary(0.0F) & " : " & 0.0F.ToString())
        Console.WriteLine(GetBinary(-0.0F) & " : " & -0.0F.ToString())
        Console.WriteLine(GetBinary(Single.Epsilon) & " : " & _
                          Single.Epsilon.ToString())
        Console.WriteLine(GetBinary(-1.401298E-45F) & " : " & _
                          -1.401298E-45F.ToString())
        Console.WriteLine(GetBinary(Single.PositiveInfinity) & " : " & _
                          Single.PositiveInfinity.ToString())
        Console.WriteLine(GetBinary(Single.NegativeInfinity) & " : " & _
                          Single.NegativeInfinity.ToString())
        '
        Console.ReadLine()
    End Sub
    Public Function GetBinary(ByVal value As Byte) As String
        For counter As Integer = 1 To 8
            GetBinary = (value Mod 2).ToString() & GetBinary
            value >>= 1
        Next
    End Function
    Public Function GetBinary(ByVal value As Single) As String
        If BitConverter.IsLittleEndian Then
            For Each byteElement As Byte In BitConverter.GetBytes(value)
                GetBinary = GetBinary(byteElement) & GetBinary
            Next
        Else
            Throw New ApplicationException("Only Little Endian supported.")
        End If
    End Function
End Module
Module Example4
    Sub Main()
        Dim singleOperands As Single() = {Single.PositiveInfinity, _
                                          Single.NegativeInfinity, _
                                          123.0F, -123.0F, 0.0F, -0.0F}
        Dim operatorSymbols As String() = {"*", "/", "+", "-"}
        '
        For Each operatorSymbol As String In operatorSymbols
            Console.WriteLine("OPERATOR " & operatorSymbol.ToString())
            Console.WriteLine()
            For Each singleOperand1 As Single In singleOperands
                For Each singleOperand2 As Single In singleOperands
                    PrintCalculation(singleOperand1, operatorSymbol, _
                                     singleOperand2)
                Next
                Console.WriteLine()
            Next
            Console.WriteLine()
        Next
        '
        Console.ReadLine()
    End Sub
    Sub PrintCalculation(ByVal operand1 As Single, _
                         ByVal operatorSymbol As String, _
                         ByVal operand2 As Single)
        Console.Write(GetString(operand1) & " " & operatorSymbol & " " & _
                      GetString(operand2) & " = ")
        Select Case operatorSymbol
            Case "*"
                Console.WriteLine(GetString(operand1 * operand2))
            Case "/"
                Console.WriteLine(GetString(operand1 / operand2))
            Case "+"
                Console.WriteLine(GetString(operand1 + operand2))
            Case "-"
                Console.WriteLine(GetString(operand1 - operand2))
        End Select
    End Sub
    Function GetString(ByVal value As Single) As String
        If IsPositiveZero(value) Then
            GetString = "+0"
        ElseIf IsNegativeZero(value) Then
            GetString = "-0"
        ElseIf Single.IsNegativeInfinity(value) Then
            GetString = "-Infinity"
        ElseIf Single.IsPositiveInfinity(value) Then
            GetString = "+Infinity"
        ElseIf Single.IsNaN(value) Then
            GetString = "NaN"
        Else
            GetString = value.ToString()
        End If
    End Function
    Public Function IsPositiveZero(ByVal value As Single) As Boolean
        If BitConverter.GetBytes(value)(0) = 0 AndAlso _
           BitConverter.GetBytes(value)(1) = 0 AndAlso _
           BitConverter.GetBytes(value)(2) = 0 AndAlso _
           BitConverter.GetBytes(value)(3) = 0 Then _
           IsPositiveZero = True
    End Function
    Public Function IsNegativeZero(ByVal value As Single) As Boolean
        If BitConverter.GetBytes(value)(0) = 0 AndAlso _
           BitConverter.GetBytes(value)(1) = 0 AndAlso _
           BitConverter.GetBytes(value)(2) = 0 AndAlso _
           BitConverter.GetBytes(value)(3) = 128 Then _
           IsNegativeZero = True
    End Function
End Module

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