Debug.Log(2000.0f * 000.1f); is 200

Unity Engine
1

Debug.Log(2000.0f * 000.1f);

Someone help me out here.
Why is that.

2

0.1 is 10%. What were you expecting?

3 Likes
3

lol yeah. sorry I misread/missed the misplaced decimal point: XD more coffee required

2 Likes
4

Now that you have had your coffee, don’t forget about floating point imprecision:

// @kurtdekker: don't forget about floating point imprecision
using UnityEngine;
public class FloatingPointImprecision : MonoBehaviour
{
    void Start ()
    {
        float a = 2000.0f;
        float b = 0.1f;
        float product = (a * b);
        float answer = 200;

        Debug.Log( "a = " + a);
        Debug.Log( "b = " + b);
        Debug.Log( "product of a*b = " + product);
        Debug.Log( "answer = " + answer);
        Debug.Log( "does product equal answer? " + (product == answer));
        Debug.Log( "does a*b equal answer? " + ((a * b) == answer));
    }
}

7399994--904268--floating_point_imprecision.png

Your mileage almost certainly will vary. Choose an epsilon term and know it well.

1 Like
5

It’s posts like this that make me glad I do Stupid mistakes.

I would <3 this twice if I could

1 Like