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Question by Lukephos · Feb 16, 2018 at 01:03 AM · c#rounding

C# Round either up or down at .5

Why the hell does the round function go to the nearest even number!? I feel like I'm going crazy, or must be missing something, but as far as I can find there's no function to just either round up or down at .5. There's fairly easy workarounds and I've got it to do what I need to do but this is baffling to me. Why is this a thing?! Someone please explain. I feel like I must be missing something if I can't find an answer to this already. Hopefully I'm not just too tired to realize at the minute. Also not trying to be mad or anything here, just really can't stress enough how much this confuses me.

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avatar image Tom507 · Feb 16, 2018 at 01:13 AM 0
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maybe refrase your question. Isn't rounding in any interpretation "going to the nearest even number"? There is $$anonymous$$athf.Abs()wich just cuts of the uneven stuff so its always rounding down.

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avatar image toddisarockstar · Feb 16, 2018 at 02:10 AM 0
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i think you might be doing something wrong. i just tested this as working from microsoft's math library:

             int rounded = (int)($$anonymous$$ath.Round(15.4f));
             print("rounded:" + rounded);//prints 15
                 rounded = (int)($$anonymous$$ath.Round(15.6f));
             print("rounded:" + rounded);//prints 16

also i have never had problems with mathf functions in unity either. post your code if you are having problems

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Answer by Meguia · Feb 16, 2018 at 02:07 AM

Hi @Lukephos !

The behavior of Unity's Mathf.Round() is the same as the default C# version Math.Round(). As explained here, the default C# behavior uses ToEven convention.

In C# you can use MidpointRounding enum as a parameter of Math.Round() to choose it's behavior but I think you can't do the same with Unity's Mathf.Round() ¯\_(ツ)_/¯

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Answer by ElijahShadbolt · Feb 16, 2018 at 08:00 PM

 public static float MyRound(float value) {
     if (value % 0.5f == 0)
         return Mathf.Ceil(value);
     else
         return Mathf.Floor(value);
 }

Example Output:

 MyRound(5.5f) => 6
 MyRound(4.5f) => 5
 MyRound(0.5f) => 1
 MyRound(-0.5f) => 0
 MyRound(-1.5f) => -1
 MyRound(4.0f) => 4
 MyRound(3.0f) => 3
 MyRound(3.4999f) => 3
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