Decimal.Round function with 0 precision is rounding the decimal to nearest even number if the fractional component of the decimal is 0.5

I am trying to use Decimal.Round to round a decimal value to 0 decimal precision. It's giving me different results for different decimal values.
For Example Decimal.Round( 40.5, 0 ) = 40 and Decimal.Round( 41.5, 0) = 42
It may be due to the fact that Decimal.Round function with 0 precision is rounding the decimal to nearest even number if the fractional component of the decimal is 0.5.
Does anyone know what I am doing anything wrong here and a solution for this?

fractions decimal.round

asked 30 Sep, 11:33

Nitin Chhabra
101●22●25●29
accept rate: 33%

One Answer:

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Graphite’s Decimal.Round system function uses Math.Round function of .net framework that has default rounding to nearest even (banker’s rounding).

If you are looking to round the decimal (D) with fractional component >= 0.5 to D + 1 and <0.5 to D -1, then here is the possible solution:

Create a behavior with the following logic –

Use Decimal.Floor to get the floor value of decimal (D)
Subtract the decimal (D) from the floor value to get the fractional component
Use a decision shape to check the fractional component is >=0.5 a. If >=0.5, use Decimal.Ceiling and assign it to return value b. If <0.5, use Decimal.Floor and assign it to return value

You can run this behavior from places where you expect to see the above results.

Hope this helps.

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answered 30 Sep, 11:35

Nitin Chhabra
101●22●25●29
accept rate: 33%

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Asked: 30 Sep, 11:33

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Last updated: 30 Sep, 11:35

Decimal.Round function with 0 precision is rounding the decimal to nearest even number if the fractional component of the decimal is 0.5

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