C# Trouble having one object's script adjust variable on another object's script?

Questions & Answers
1

Sorry, I know this has been addressed on here before, [specifically here][1], but for some reason I can’t seem to get it to work. I have two scripts, one on the projectile “S_forwardProjectile.cs” and the other on the enemy “S_weakEnemy.cs”. When the projectile hits the enemy it should reduce the enemies health. I think the problem is something to do with my GetComponent line in “S_forwardProjectile.cs” as that is where I am getting the compile error.

“S_forwardProjectile.cs”

using UnityEngine;
using System.Collections;

public class S_forwardProjectile : MonoBehaviour {
	
	public float projectileSpeed;
	public float projectileDamage;
			
	// Use this for initialization
	void Start () 
	{
	
	}
	
	// Update is called once per frame
	void Update () 
	{
		//Moves projectile.
		float amtToMove = projectileSpeed * Time.deltaTime;
		transform.Translate(Vector3.up * amtToMove);
		
		//Destroys projectile when off screen.
		if (transform.position.y > 8.5f)
			Destroy(gameObject);
	}
	
	
	//Damages enemies when projectile hits them.
	void OnTriggerEnter (Collider other)
	{
		//Debug.Log("We hit " + otherObject.name);
		
		if (other.gameObject.tag == "enemy")
		{
			if (transform.localScale == new Vector3(0.8f, 0.8f, 0.8f))
			projectileDamage = 3f;
			
			if (transform.localScale == new Vector3(0.5f, 0.5f, 0.5f))
			projectileDamage = 2f;
			
			if (transform.localScale == new Vector3(0.2f, 0.2f, 0.2f))
			projectileDamage = 1f;
			
			other.gameObject.GetComponent<S_weakEnemy>().enemyHealth = enemyHealth - projectileDamage;
			
			Destroy(gameObject);
		}
	}
}

“S_weakEnemy.cs”

using UnityEngine;
using System.Collections;

public class S_weakEnemy : MonoBehaviour {

	public float enemyHealth;
	
		
	// Use this for initialization
	void Start () 
	{
	
	}
	
	// Update is called once per frame
	void Update () 
	{
	
		if (enemyHealth <= 0f)
			Destroy(gameObject);
		
	}
}

I tried to go over it several times to make sure I didn’t have a spelling error or something. I am just learning programming, so I am probably just doing something stupid, but for the life of me I can’t figure out what.

Thanks for looking.
[1]: (C#) My enemy dosent take damage ScriptFix - Unity Answers

2

Instead of guessing the error is in your Getcomponent line, how about posting the error? It contains a line number and an exact description of the error.

Anyways your problem is simply that you assign a value enemyHealth of S_weakEnemy, but what you assign doesn’t make sense. “enemyHealth” doesn’t exist in your “S_forwardProjectile” class. You either have to use

    S_weakEnemy enemy = other.gameObject.GetComponent<S_weakEnemy>();
    enemy.enemyHealth = enemy.enemyHealth - projectileDamage;

Or the short for with -=

    S_weakEnemy enemy = other.gameObject.GetComponent<S_weakEnemy>();
    enemy.enemyHealth -= projectileDamage;

Which can also be written in one line like this:

    other.gameObject.GetComponent<S_weakEnemy>().enemyHealth -= projectileDamage;