C # Math.Round error with x.95

Question

Just stumbled upon one strange problem:

Math.Round(113.065, 2, MidpointRounding.ToEven) => 113.06 Math.Round(113.075, 2, MidpointRounding.ToEven) => 113.08 Math.Round(113.085, 2, MidpointRounding.ToEven) => 113.08 

But...

 Math.Round(113.095, 2, MidpointRounding.ToEven) => 113.1 

Why is this happening? I want my result to be 113.09! Is it possible?

thanks

Answer 1

 Math.Round(113.095, 2, MidpointRounding.ToEven) => 113.1 

It is even . Read it with two decimal places:

113.10

10 will be even. The trimmed right zero just makes it look odd (“odd” in the sense of “not even”, not to be confused as “odd” meaning “strange”), but that’s why it shows this path.

Also, your examples in your question are inaccurate. Here is the result from those that will further strengthen why you get x.1 as output:

 Math.Round(113.065, 2, MidpointRounding.ToEven) => 113.06 Math.Round(113.075, 2, MidpointRounding.ToEven) => 113.08 Math.Round(113.085, 2, MidpointRounding.ToEven) => 113.08 

Note that rounding 113.075 ToEven results in 113.0 8 , not 113.0 7 .

Full example:

 Math.Round(113.065, 2, MidpointRounding.ToEven) => 113.06 Math.Round(113.075, 2, MidpointRounding.ToEven) => 113.08 Math.Round(113.085, 2, MidpointRounding.ToEven) => 113.08 Math.Round(113.095, 2, MidpointRounding.ToEven) => 113.1 

Which can also be read as:

 Math.Round(113.065, 2, MidpointRounding.ToEven) => 113.06 Math.Round(113.075, 2, MidpointRounding.ToEven) => 113.08 Math.Round(113.085, 2, MidpointRounding.ToEven) => 113.08 Math.Round(113.095, 2, MidpointRounding.ToEven) => 113.10 

If the conclusion in your question is really what you want to get ... (i.e. if this is really your desired result, and you just want to know what you need to do to get this conclusion)

 Math.Floor(113.065 * 100) / 100 => 113.06 Math.Floor(113.075 * 100) / 100 => 113.07 Math.Floor(113.085 * 100) / 100 => 113.08 Math.Floor(113.095 * 100) / 100 => 113.09