Xp not working

Questions & Answers
1

In my game when you kill an enemy it spawn “xp ball” that you can take and get xp. But allways when i take the “xpball” it sets xp to 0.3 when it should add 0.3 when player is lvl 0. Im pretty noob at coding and i think is should be right when i wrote xp += 0.3. Here is the code:

public class Exp : MonoBehaviour
{
    public GameObject XpBar;
    float xp = 0;
    int level = 0;
    public Text Lvl;
    void Start()
    {
        xp = 0;
    }

    // Update is called once per frame
    void Update()
    {
        
        Lvl.text = (level.ToString());
        print(xp);
        if (xp > 1)
        {
            xp = 0;
            level += 1;
            
        }
        
    }
    void OnTriggerEnter2D(Collider2D other)
    {
        if (other.tag == "Player")
        {
            if (level == 0)
            {
                xp += 0.3f;
                XpBar.transform.localScale = new Vector3(xp, 1, 1);
                print(xp);
                Destroy(gameObject);
            }
            if (level == 1)
            {
                xp += 0.2f;
                XpBar.transform.localScale = new Vector3(xp, 1, 1);
                print(xp);
                Destroy(gameObject);
            }
            if (level == 2)
            {
                xp += 0.05f;
                XpBar.transform.localScale = new Vector3(xp, 1, 1);
                Destroy(gameObject);
            }
            if (level == 3)
            {
                xp += 0.01f;
                XpBar.transform.localScale = new Vector3(xp, 1, 1);
                Destroy(gameObject);
            }
            if (level == 4)
            {
                xp += 0.005f;
                XpBar.transform.localScale = new Vector3(xp, 1, 1);
                Destroy(gameObject);
            }

        }
    }

    
}
2

According to your code, the component is attached on the balls, and that’s clearly the problem. It should be attached to the Player.

I’ve reworked a little bit the script to handle this new setup and made it clearer (and more performant)

public class PlayerExperience : MonoBehaviour
{
    public GameObject ExperienceBar;
    public Text LevelText;
    public float[] ExperiencePerLevel = new float[]
    {
        0.300f,
        0.200f,
        0.050f,
        0.010f,
        0.005f
    }

    private float experience = 0;
    private int level = 0;

    public float Experience
    {
        get
        {
            return experience;
        }
        private set
        {
            experience = value ;
            ExperienceBar.transform.localScale = new Vector3(experience, 1, 1);
            if(experience > 1)
            {
                Level += (int) experience;
                experience = 0;
            }
        }
    }

    public int Level
    {
        get
        {
            return level;
        }
        private set
        {
            level = value ;
            LevelText.text = level.ToString();
        }
    }

    void Start()
    {
        Experience = 0;
    }

    void OnTriggerEnter2D(Collider2D other)
    {
        // Tag the XP balls as follow `XPBall`
        if (other.CompareTag("XPBall"))
        {
            Experience += ExperiencePerLevel[Level] ;
            Destroy(other.gameObject);
        }
    }
}