本文整理匯總了VB.NET中System.Double.Equals方法的典型用法代碼示例。如果您正苦於以下問題：VB.NET Double.Equals方法的具體用法？VB.NET Double.Equals怎麽用？VB.NET Double.Equals使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類System.Double的用法示例。
在下文中一共展示了Double.Equals方法的5個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的VB.NET代碼示例。
示例1:
' Initialize two doubles with apparently identical values
Dim double1 As Double = .33333
Dim double2 As Double = 1/3
' Compare them for equality
Console.WriteLine(double1.Equals(double2)) ' displays False示例2:
' Initialize two doubles with apparently identical values
Dim double1 As Double = .33333
Dim double2 As Double = 1/3
' Define the tolerance for variation in their values
Dim difference As Double = Math.Abs(double1 * .00001)
' Compare the values
' The output to the console indicates that the two values are equal
If Math.Abs(double1 - double2) <= difference Then
Console.WriteLine("double1 and double2 are equal.")
Else
Console.WriteLine("double1 and double2 are unequal.")
End If示例3: Main
Module Example
Public Sub Main()
Dim value1 As Double = .1 * 10
Dim value2 As Double = 0
For ctr As Integer = 0 To 9
value2 += .1
Next
Console.WriteLine("{0:R} = {1:R}: {2}", value1, value2,
HasMinimalDifference(value1, value2, 1))
End Sub
Public Function HasMinimalDifference(value1 As Double, value2 As Double, units As Integer) As Boolean
Dim lValue1 As long = BitConverter.DoubleToInt64Bits(value1)
Dim lValue2 As long = BitConverter.DoubleToInt64Bits(value2)
' If the signs are different, Return False except for +0 and -0.
If ((lValue1 >> 63) <> (lValue2 >> 63)) Then
If value1 = value2 Then
Return True
End If
Return False
End If
Dim diff As Long = Math.Abs(lValue1 - lValue2)
If diff <= units Then
Return True
End If
Return False
End Function
End Module輸出：
1 = 0.99999999999999989: True
示例4: Example
Module Example
Dim value As Double = 112
Public Sub Main()
Dim byte1 As Byte = 112
Console.WriteLine("value = byte1: {0,16}", value.Equals(byte1))
TestObjectForEquality(byte1)
Dim short1 As Short = 112
Console.WriteLine("value = short1: {0,16}", value.Equals(short1))
TestObjectForEquality(short1)
Dim int1 As Integer = 112
Console.WriteLine("value = int1: {0,18}", value.Equals(int1))
TestObjectForEquality(int1)
Dim long1 As Long = 112
Console.WriteLine("value = long1: {0,17}", value.Equals(long1))
TestObjectForEquality(long1)
Dim sbyte1 As SByte = 112
Console.WriteLine("value = sbyte1: {0,16}", value.Equals(sbyte1))
TestObjectForEquality(sbyte1)
Dim ushort1 As UShort = 112
Console.WriteLine("value = ushort1: {0,16}", value.Equals(ushort1))
TestObjectForEquality(ushort1)
Dim uint1 As UInteger = 112
Console.WriteLine("value = uint1: {0,18}", value.Equals(uint1))
TestObjectForEquality(uint1)
Dim ulong1 As ULong = 112
Console.WriteLine("value = ulong1: {0,17}", value.Equals(ulong1))
TestObjectForEquality(ulong1)
Dim dec1 As Decimal = 112d
Console.WriteLine("value = dec1: {0,20}", value.Equals(dec1))
TestObjectForEquality(dec1)
Dim sng1 As Single = 112
Console.WriteLine("value = sng1: {0,19}", value.Equals(sng1))
TestObjectForEquality(sng1)
End Sub
Private Sub TestObjectForEquality(obj As Object)
Console.WriteLine("{0} ({1}) = {2} ({3}): {4}",
value, value.GetType().Name,
obj, obj.GetType().Name,
value.Equals(obj))
Console.WriteLine()
End Sub
End Module輸出：
value = byte1: True 112 (Double) = 112 (Byte): False value = short1: True 112 (Double) = 112 (Int16): False value = int1: True 112 (Double) = 112 (Int32): False value = long1: True 112 (Double) = 112 (Int64): False value = sbyte1: True 112 (Double) = 112 (SByte): False value = ushort1: True 112 (Double) = 112 (UInt16): False value = uint1: True 112 (Double) = 112 (UInt32): False value = ulong1: True 112 (Double) = 112 (UInt64): False value = dec1: True 112 (Double) = 112 (Decimal): False value = sng1: True 112 (Double) = 112 (Single): False
示例5:
' Initialize two doubles with apparently identical values
Dim double1 As Double = .33333
Dim double2 As Object = 1/3
' Compare them for equality
Console.WriteLine(double1.Equals(double2)) ' displays False