Decimal Round Up Question

[Tsair]

I found the decimal round up problem,

System.Math.Round(106.865, 2)= 106.86
System.Math.Round(106.875, 2) = 106.88
System.Math.Round(106.885, 2) = 106.88
System.Math.Round(106.895, 2) = 106.9

Why some time it round up the 5 and sometime roun down the 5 ?

[Cor Ligthert [MVP]]

Tsair,

Because DotNet uses the ISO Banking rounding method. On my question in these
newsgroups who was using that beside Banks (between each other not to
customers) I never got any anser.

In past there where a lot of articles about that on MSDN but I cannot find
them anymore. It is about the even and odd situation of a value that tells
it it is rounded up or down.

Cor
"Tsair" <ts***@myjaring.netschreef in bericht
news:eb**************@TK2MSFTNGP02.phx.gbl...

>I found the decimal round up problem,

System.Math.Round(106.865, 2)= 106.86
System.Math.Round(106.875, 2) = 106.88
System.Math.Round(106.885, 2) = 106.88
System.Math.Round(106.895, 2) = 106.9

Why some time it round up the 5 and sometime roun down the 5 ?

[Jon Skeet [C# MVP]]

Tsair <ts***@myjaring.netwrote:

I found the decimal round up problem,

System.Math.Round(106.865, 2)= 106.86
System.Math.Round(106.875, 2) = 106.88
System.Math.Round(106.885, 2) = 106.88
System.Math.Round(106.895, 2) = 106.9

Why some time it round up the 5 and sometime roun down the 5 ?

Firstly, just to be clear, this is talking about rounding the Double
type, not the Decimal type.

Secondly, this behaviour is as described in the documentation for
Math.Round:

<quote>
Return Value
The number nearest value with a precision equal to digits. If value is
halfway between two numbers, one of which is even and the other odd,
then the even number is returned. If the precision of value is less
than digits, then value is returned unchanged.
</quote>

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