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Summary: Round function to avoid banker's rounding
Language: VB.NET
Author: Toby Knott
Author snippets RSS:
Culture: en-US
Bytes: 696
Visual Studio 2005 Snippet:

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Downloads: 81
Overall rating : 3
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' all the framework rounding methods use banker's rounding
' if a number is exactly halfway between two numbers, it will round to the nearest even
' i.e. - 3.5 will round to 4, but 2.5 will round to 2
Function Round(ByVal dVal As Decimal, ByVal lScale As Int32) As Decimal
   Dim lMltply As Int32
   Dim dAdd As Decimal
   ' find half of the least significant digit
   dAdd = CType(Math.Pow(0.1, lScale) * 0.5, Decimal)
   If dVal < 0 Then dAdd *= -1
   ' initialize multiplier
   lMltply = CType(Math.Pow(10, lScale), Int32)
   ' add half of the least significant digit, times the multiplier, truncate,
   ' and divide by the multiplier
   Return Decimal.Truncate((dVal + dAdd) * lMltply) / lMltply
End Function

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