Potential math bug

I'm sure I'm wrong and it's a simple mistake but:
I'm using the formula: x + (y * width), to convert from a multi to single dimension array.

In this case the values were
x = 3
y = 1
width = 10
and the result should have been 13 but it came out as 12.

I've attached a screenshot of the process in debug (ignore the exception type) and the code below.

Width is a constant set to 10

Code (csharp):

1.  
2. public int GetCoord(Vector3 vector){
3.    int value = (int) (vector.z + (vector.x * width));
4.    if (vector.x * 10 + vector.z != value) {
5.       throw new System.IndexOutOfRangeException();
6.    }
7.    return value;
8. }
9.  

 

Use Mathf.RoundToInt instead of casting to int. I bet you a dollar that "(vector.z+(vector.x* width))" is returning something like 12.99999, and simply casting to an int makes floats round down.

 

I tried
Mathf.RoundToInt(vector.z+(vector.x* width))
and
((int)vector.z) + (((int)vector.x) * width)

but neither work, I should mention it only seems to happen most of the time.

 

If you're judging whether it works by this:

Then you're having the exact same issue twice. It'll once again give you a result like 12.9999, even if 'value' is now correctly 13 it'll report that it's wrong.

 

Yes, I removed that and checked by just logging the results of calling GetCoord() repeatedly

 

Ah, nevermind, apparently I implemented your fix incorrectly the first time. It's working fine now that I've written it again.
Thank you.