Round vs RoundToInt

Question: what's the difference between Mathf.Round and Mathf.RoundToInt? (Or CeilToInt or FloorToInt, for that matter.)

I would have expected one to result in a float, and the other to result in an int. What's the difference?

 

You're correct - that is the difference.

 

But I did a test with Debug.Log... Mathf.Round(10.7) came up as 10 instead of 10.0. Should there not have been a decimal?

 

No, for the same reason that

Code (csharp):

1.  
2. public float foo = 10f;
3.  

is perfectly legal.

 

Yes same problem here...

Why does the Unity's Round function return INT but the usual Round function is used as the following?


a = Math.Round (1.234 ,2);
>>> a = 1.23

And Unity's one :

a = Mathf.Round (1.234f);
a = 1;

Is there an existing function into Unity working like the first example?

- http://msdn.microsoft.com/en-us/library/system.math.round(v=vs.71).aspx


EDIT :

Also reading that :
- http://answers.unity3d.com/questions/50391/how-to-round-a-float-to-2-dp.html

Code (csharp):

1. yourFloat = Mathf.Round(yourFloat * 100f) / 100f;

LOL ??? ??

 

Since you asked pointed to this thread from that other one which (went off-topic badly), I thought I may post the relevant parts from the other thread there, as others may be interested in it too.

I'm not sure what your problem was over there. Documentation clearly states that Mathf.Round and Mathf.RoundToInt both methods round to the next integer. The only difference is, that Mathf.Round returns an float type value and Mathf.RoundToInt returns an integer type value, which saves you 1 casting and compiler warning, when working with strong typing.

Documentation clearly states that Mathf.Round(...) is equivalent to Math.Round(..., 0); in .NET Framework.

So if you want to round to 2 decimals, just use Math.Round(..., x) (the Mono/.NET implementation of Round).

However, Math.Round in Mono/.NET only takes returns decimals () and doubles, so if you use them you have to cast back to float

Code (csharp):

1.  
2. float percent = 23.239f;
3. percent = (float)Math.Round(percent, 2);
4.  

since most values used in Unity (i.e. Vectors etc) are floats. If you want to complain, complain to Unity why they only implemented round to integers.