Why is the "col" objects tag not changing?

Hi!
I want both the gameobject that the script is attached to to change tag to "0"(upon collision) -- but also the gameobject that it is colliding with, col, to change. Unfortunately col does not change tag. The col object also has this script attached to itself.

Code (CSharp):

1.     void OnCollisionEnter2D (Collision2D col) {
2.         if(col.gameObject.tag[1] == gameObject.tag[1] && gameObject.tag != "0" && gameObject.tag != "4" && col.gameObject.tag[0] != gameObject.tag[0]) {
3.             gameObject.tag = "0";
4.             col.gameObject.tag = "0";
5.             joint.connectedBody = col.gameObject.GetComponent<Rigidbody2D>();
6.             joint.enabled = true;
7.             valenceText.text = gameObject.name + System.Environment.NewLine + gameObject.tag;
8.         }
9.     }

 

your if statement is pretty horrific
indexing a tag is just picking letters from the tag
if your tags are just "0", "4", etc then tag[1] will be out of range
whereas, if your tag is "ball" then tag[1] = the letter 'a'

 

I am well aware but that has nothing to do with my question.

 

Well there's a few things you can do to figure out why it's not working as expected

Code (CSharp):

1.         void OnCollisionEnter2D (Collision2D col) {
2. Debug.Log("Collision happened between " + gameObject.name + " and " + col.gameObject.name);
3. Debug.Log("Their tags are " + gameObject.tag + " and " + col.gameObject.tag);
4.        //...
5.         }
6.  

That way you can see what's going on, and then follow your logic through