VB.NET Math.Round方法代码示例

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本文整理汇总了VB.NET中System.Math.Round方法的典型用法代码示例。如果您正苦于以下问题：VB.NET Math.Round方法的具体用法？VB.NET Math.Round怎么用？VB.NET Math.Round使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.Math的用法示例。

在下文中一共展示了Math.Round方法的16个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的VB.NET代码示例。

示例1: Example

Module Example
   Public Sub Main()
      Dim values() As Decimal = { 1.15d, 1.25d, 1.35d, 1.45d, 1.55d, 1.65d }
      Dim sum As Decimal
      
      ' Calculate true mean.
      For Each value In values
         sum += value
      Next
      Console.WriteLine("True mean:     {0:N2}", sum/values.Length)
      
      ' Calculate mean with rounding away from zero.
      sum = 0
      For Each value In values
         sum += Math.Round(value, 1, MidpointRounding.AwayFromZero)
      Next
      Console.WriteLine("AwayFromZero:  {0:N2}", sum/values.Length)
      
      ' Calculate mean with rounding to nearest.
      sum = 0
      For Each value In values
         sum += Math.Round(value, 1, MidpointRounding.ToEven)
      Next
      Console.WriteLine("ToEven:        {0:N2}", sum/values.Length)
   End Sub
End Module

开发者ID:VB.NET开发者，项目名称:System，代码行数:26，代码来源:Math.Round

输出：

True mean:     1.40
AwayFromZero:  1.45
ToEven:        1.40

示例2: Example

Module Example
   Public Sub Main()
      Dim value As Double = 11.1

      Console.WriteLine("{0,5} {1,20:R}  {2,12} {3,15}\n", 
                        "Value", "Full Precision", "ToEven",
                        "AwayFromZero")
      For ctr As Integer = 0 To 5    
         value = RoundValueAndAdd(value)
      Next
      Console.WriteLine()

      value = 11.5
      RoundValueAndAdd(value)
   End Sub
   
   Private Function RoundValueAndAdd(value As Double) As Double
      Const tolerance As Double = 8e-14
      Console.WriteLine("{0,5:N1} {0,20:R}  {1,12} {2,15}", 
                        value, 
                        RoundApproximate(value, 0, tolerance, MidpointRounding.ToEven),
                        RoundApproximate(value, 0, tolerance, MidpointRounding.AwayFromZero))
      Return value + .1
   End Function   

   Private Function RoundApproximate(dbl As Double, digits As Integer, margin As Double, 
                                     mode As MidpointRounding) As Double
      Dim fraction As Double = dbl * Math.Pow(10, digits)
      Dim value As Double = Math.Truncate(fraction) 
      fraction = fraction - value   
      If fraction = 0 Then Return dbl
      
      Dim tolerance As Double = margin * dbl
      ' Determine whether this is a midpoint value.
      If (fraction >= .5 - tolerance) And (fraction <= .5 + tolerance) Then
         If mode = MidpointRounding.AwayFromZero Then
            Return (value + 1)/Math.Pow(10, digits)
         Else
            If value Mod 2 <> 0 Then
               Return (value + 1)/Math.Pow(10, digits)
            Else
               Return value/Math.Pow(10, digits)
            End If
         End If
      End If
      ' Any remaining fractional value greater than .5 is not a midpoint value.
      If fraction > .5 Then
         Return (value + 1)/Math.Pow(10, digits)
      Else
         return value/Math.Pow(10, digits)
      End If      
   End Function
End Module

开发者ID:VB.NET开发者，项目名称:System，代码行数:53，代码来源:Math.Round

输出：

Value       Full Precision        ToEven    AwayFromZero

11.1                 11.1            11              11
11.2                 11.2            11              11
11.3   11.299999999999999            11              11
11.4   11.399999999999999            11              11
11.5   11.499999999999998            12              12
11.6   11.599999999999998            12              12

11.5                 11.5            12              12

示例3: Example

Module Example
   Public Sub Main()
      Dim value As Single = 16.325
      Console.WriteLine("Widening Conversion of {0:R} (type {1}) to {2:R} (type {3}): ", 
                        value, value.GetType().Name, CDbl(value), 
                        CDbl(value).GetType().Name)
      Console.WriteLine(Math.Round(value, 2))
      Console.WriteLine(Math.Round(value, 2, MidpointRounding.AwayFromZero))
      Console.WriteLine()
      
      Dim decValue As Decimal = CDec(value)
      Console.WriteLine("Cast of {0:R} (type {1}) to {2} (type {3}): ", 
                        value, value.GetType().Name, decValue, 
                        decValue.GetType().Name)
      Console.WriteLine(Math.Round(decValue, 2))
      Console.WriteLine(Math.Round(decValue, 2, MidpointRounding.AwayFromZero))
      Console.WriteLine()
   End Sub
End Module

开发者ID:VB.NET开发者，项目名称:System，代码行数:19，代码来源:Math.Round

输出：

Widening Conversion of 16.325 (type Single) to 16.325000762939453 (type Double):
16.33
16.33

Cast of 16.325 (type Single) to 16.325 (type Decimal):
16.32
16.33

示例4: Sample

' This example demonstrates the Math.Round() method in conjunction 
' with the MidpointRounding enumeration.
Class Sample
    Public Shared Sub Main() 
        Dim result As Decimal = 0D
        Dim posValue As Decimal = 3.45D
        Dim negValue As Decimal = -3.45D
        
        ' By default, round a positive and a negative value to the nearest even number. 
        ' The precision of the result is 1 decimal place.
        result = Math.Round(posValue, 1)
        Console.WriteLine("{0,4} = Math.Round({1,5}, 1)", result, posValue)
        result = Math.Round(negValue, 1)
        Console.WriteLine("{0,4} = Math.Round({1,5}, 1)", result, negValue)
        Console.WriteLine()
        
        ' Round a positive value to the nearest even number, then to the nearest number 
        ' away from zero. The precision of the result is 1 decimal place.
        result = Math.Round(posValue, 1, MidpointRounding.ToEven)
        Console.WriteLine("{0,4} = Math.Round({1,5}, 1, MidpointRounding.ToEven)", _
                           result, posValue)
        result = Math.Round(posValue, 1, MidpointRounding.AwayFromZero)
        Console.WriteLine("{0,4} = Math.Round({1,5}, 1, MidpointRounding.AwayFromZero)", _
                           result, posValue)
        Console.WriteLine()
        
        ' Round a negative value to the nearest even number, then to the nearest number 
        ' away from zero. The precision of the result is 1 decimal place.
        result = Math.Round(negValue, 1, MidpointRounding.ToEven)
        Console.WriteLine("{0,4} = Math.Round({1,5}, 1, MidpointRounding.ToEven)", _
                            result, negValue)
        result = Math.Round(negValue, 1, MidpointRounding.AwayFromZero)
        Console.WriteLine("{0,4} = Math.Round({1,5}, 1, MidpointRounding.AwayFromZero)", _
                           result, negValue)
        Console.WriteLine()
    
    End Sub
End Class

开发者ID:VB.NET开发者，项目名称:System，代码行数:38，代码来源:Math.Round

输出：

3.4 = Math.Round( 3.45, 1)
-3.4 = Math.Round(-3.45, 1)

3.4 = Math.Round( 3.45, 1, MidpointRounding.ToEven)
3.5 = Math.Round( 3.45, 1, MidpointRounding.AwayFromZero)

-3.4 = Math.Round(-3.45, 1, MidpointRounding.ToEven)
-3.5 = Math.Round(-3.45, 1, MidpointRounding.AwayFromZero)

示例5: Example

Module Example
    Public Sub Main() 
        Dim posValue As Double = 3.45
        Dim negValue As Double = -3.45
        
        ' Round a positive and a negative value using the default.  
        Dim result As Double = Math.Round(posValue, 1)
        Console.WriteLine("{0,4} = Math.Round({1,5}, 1)", result, posValue)
        result = Math.Round(negValue, 1)
        Console.WriteLine("{0,4} = Math.Round({1,5}, 1)", result, negValue)
        Console.WriteLine()
        
        ' Round a positive value using a MidpointRounding value. 
        result = Math.Round(posValue, 1, MidpointRounding.ToEven)
        Console.WriteLine("{0,4} = Math.Round({1,5}, 1, MidpointRounding.ToEven)", 
                           result, posValue)
        result = Math.Round(posValue, 1, MidpointRounding.AwayFromZero)
        Console.WriteLine("{0,4} = Math.Round({1,5}, 1, MidpointRounding.AwayFromZero)", 
                           result, posValue)
        Console.WriteLine()
        
        ' Round a positive value using a MidpointRounding value. 
        result = Math.Round(negValue, 1, MidpointRounding.ToEven)
        Console.WriteLine("{0,4} = Math.Round({1,5}, 1, MidpointRounding.ToEven)", 
                            result, negValue)
        result = Math.Round(negValue, 1, MidpointRounding.AwayFromZero)
        Console.WriteLine("{0,4} = Math.Round({1,5}, 1, MidpointRounding.AwayFromZero)", 
                           result, negValue)
        Console.WriteLine()
    End Sub
End Module

开发者ID:VB.NET开发者，项目名称:System，代码行数:31，代码来源:Math.Round

输出：

3.4 = Math.Round( 3.45, 1)
-3.4 = Math.Round(-3.45, 1)

3.4 = Math.Round( 3.45, 1, MidpointRounding.ToEven)
3.5 = Math.Round( 3.45, 1, MidpointRounding.AwayFromZero)

-3.4 = Math.Round(-3.45, 1, MidpointRounding.ToEven)
-3.5 = Math.Round(-3.45, 1, MidpointRounding.AwayFromZero)

示例6: Example

Module Example
   Public Sub Main()
      Dim values() As Double = { 2.125, 2.135, 2.145, 3.125, 3.135, 3.145 }
      For Each value As Double In values
         Console.WriteLine("{0} --> {1}", value, 
                           Math.Round(value, 2, MidpointRounding.AwayFromZero))
      Next
   End Sub
End Module

开发者ID:VB.NET开发者，项目名称:System，代码行数:9，代码来源:Math.Round

输出：

2.125 --> 2.13
2.135 --> 2.13
2.145 --> 2.15
3.125 --> 3.13
3.135 --> 3.14
3.145 --> 3.15

示例7: Example

Module Example
   Public Sub Main()
      Dim values() As Double = { 12.0, 12.1, 12.2, 12.3, 12.4, 12.5, 12.6, 
                                 12.7, 12.8, 12.9, 13.0 }
      Console.WriteLine("{0,-10} {1,-10} {2,-10} {3,-15}", "Value", "Default", 
                        "ToEven", "AwayFromZero")
      For Each value In values
         Console.WriteLine("{0,-10} {1,-10} {2,-10} {3,-15}",
                           value, Math.Round(value), 
                           Math.Round(value, MidpointRounding.ToEven),
                           Math.Round(value, MidpointRounding.AwayFromZero))
      Next
   End Sub
End Module

开发者ID:VB.NET开发者，项目名称:System，代码行数:14，代码来源:Math.Round

输出：

Value      Default    ToEven     AwayFromZero
12         12         12         12
12.1       12         12         12
12.2       12         12         12
12.3       12         12         12
12.4       12         12         12
12.5       12         12         13
12.6       13         13         13
12.7       13         13         13
12.8       13         13         13
12.9       13         13         13
13.0       13         13         13

示例8: Example

Module Example
   Public Sub Main()
      Dim value As Double = 11.1
      For ctr As Integer = 0 To 5    
         value = RoundValueAndAdd(value)
      Next
      Console.WriteLine()

      value = 11.5
      RoundValueAndAdd(value)
   End Sub
   
   Private Function RoundValueAndAdd(value As Double) As Double
      Console.WriteLine("{0} --> {1}", value, Math.Round(value, 
                        MidpointRounding.AwayFromZero))
      Return value + .1
   End Function   
End Module

开发者ID:VB.NET开发者，项目名称:System，代码行数:18，代码来源:Math.Round

输出：

11.1 --> 11
11.2 --> 11
11.3 --> 11
11.4 --> 11
11.5 --> 11
11.6 --> 12

11.5 --> 12

示例9:

Math.Round(3.44, 1) 'Returns 3.4.
Math.Round(3.45, 1) 'Returns 3.4.
Math.Round(3.46, 1) 'Returns 3.5.

Math.Round(4.34, 1) ' Returns 4.3
Math.Round(4.35, 1) ' Returns 4.4
Math.Round(4.36, 1) ' Returns 4.4

开发者ID:VB.NET开发者，项目名称:System，代码行数:7，代码来源:Math.Round

示例10: Example

Module Example
   Public Sub Main()
      Dim values() As Double = { 2.125, 2.135, 2.145, 3.125, 3.135, 3.145 }
      For Each value As Double In values
         Console.WriteLine("{0} --> {1}", value, Math.Round(value, 2))
      Next
   End Sub
End Module

开发者ID:VB.NET开发者，项目名称:System，代码行数:8，代码来源:Math.Round

输出：

2.125 --> 2.12
2.135 --> 2.13
2.145 --> 2.14
3.125 --> 3.12
3.135 --> 3.14
3.145 --> 3.14

示例11: Module1

Module Module1

    Sub Main()
    Console.WriteLine("Classic Math.Round in Visual Basic")
    Console.WriteLine(Math.Round(4.4)) ' 4
    Console.WriteLine(Math.Round(4.5)) ' 4
    Console.WriteLine(Math.Round(4.6)) ' 5
    Console.WriteLine(Math.Round(5.5)) ' 6
    End Sub

End Module

开发者ID:VB.NET开发者，项目名称:System，代码行数:11，代码来源:Math.Round

示例12: Example

Module Example
   Public Sub Main()
      Dim value As Double = 11.1
      For ctr As Integer = 0 To 5    
         value = RoundValueAndAdd(value)
      Next
      Console.WriteLine()

      value = 11.5
      RoundValueAndAdd(value)
   End Sub
   
   Private Function RoundValueAndAdd(value As Double) As Double
      Console.WriteLine("{0} --> {1}", value, Math.Round(value))
      Return value + .1
   End Function   
End Module

开发者ID:VB.NET开发者，项目名称:System，代码行数:17，代码来源:Math.Round

输出：

11.1 --> 11
11.2 --> 11
11.3 --> 11
11.4 --> 11
11.5 --> 11
11.6 --> 12

11.5 --> 12

示例13: Example

Public Module Example
   Sub Main()
      Console.WriteLine(Math.Round(3.44, 1)) 
      Console.WriteLine(Math.Round(3.45, 1)) 
      Console.WriteLine(Math.Round(3.46, 1)) 
      Console.WriteLine()
      
      Console.WriteLine(Math.Round(4.34, 1)) 
      Console.WriteLine(Math.Round(4.35, 1)) 
      Console.WriteLine(Math.Round(4.36, 1)) 
   End Sub  
End Module

开发者ID:VB.NET开发者，项目名称:System，代码行数:12，代码来源:Math.Round

输出：

3.4
3.4
3.5

4.3
4.4
4.4

示例14: Example

Module Example
   Public Sub Main()
      For value As Decimal = 4.2d To 4.8d Step .1d
         Console.WriteLine("{0} --> {1}", value, Math.Round(value))
      Next   
   End Sub                                                                 
End Module

开发者ID:VB.NET开发者，项目名称:System，代码行数:7，代码来源:Math.Round

输出：

4.2 --> 4
4.3 --> 4
4.4 --> 4
4.5 --> 4
4.6 --> 5
4.7 --> 5
4.8 --> 5

示例15: Example

Module Example
   Public Sub Main()
      Console.WriteLine("{0,-10} {1,-10} {2,-10} {3,-15}", "Value", "Default", 
                        "ToEven", "AwayFromZero")
      For value As Decimal = 12.0d To 13.0d Step .1d
         Console.WriteLine("{0,-10} {1,-10} {2,-10} {3,-15}",
                           value, Math.Round(value), 
                           Math.Round(value, MidpointRounding.ToEven),
                           Math.Round(value, MidpointRounding.AwayFromZero))
      Next
   End Sub
End Module

开发者ID:VB.NET开发者，项目名称:System，代码行数:12，代码来源:Math.Round

输出：

Value      Default    ToEven     AwayFromZero
12         12         12         12
12.1       12         12         12
12.2       12         12         12
12.3       12         12         12
12.4       12         12         12
12.5       12         12         13
12.6       13         13         13
12.7       13         13         13
12.8       13         13         13
12.9       13         13         13
13.0       13         13         13

示例16: MainClass

' 导入命名空间
Imports System
Imports System.Data
Imports System.Diagnostics

public class MainClass
   Shared Sub Main()
        Console.WriteLine(System.Math.Round(1.4))
   End Sub
End Class

开发者ID:VB程序员，项目名称:System，代码行数:10，代码来源:Math.Round

注：本文中的System.Math.Round方法示例整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。