Operator Cannot Be used with a left hand type 'System.type' and a right hand type 'int'

Question

My script Keeps getting that 2 errors, when I use Health -= Damage, and when explaining the Variable Health,

 #pragma strict
 
 var Heath : int = 100;
 var bullet : GameObject;
 var damage : int;
 
 function Update () 
 {
     if (Health < 0)
     (
         DIE());
 }
 
 function OnTriggerEnter ( hit : Collider ) 
 {
     if(hit.gameObject.tag == "Bullet")
     {
         bullet = hit.gameObject;
         TakeDamage ();
     }
 }
 
 function TakeDamage ()
 {
     var BulletScript : Bullet = bullet.GetComponent("Bullet");
     damage = BulletScript.Damage;
     
     Health -= damage;
 }
 
 function DIE()
 {
     Debug.Log("I'm Dead!");
     Destroy(gameObject);
 }

Answer 1

Answer by whydoidoit · May 09, 2013 at 08:19 PM

So this is a perfect example of why following a "variable names are lower case initial letter" and "scripts are upper case first letter" really helps. You have a script called Health, you have a variable you thought was called "Health" but as @robertbu pointed out was called "Heath". If you follow the rule then you would have received a much more meaningful error message about "heath" not being found rather than the compiler thinking you were trying to do something with your Health script.

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Answer 2

Answer by Negagames · May 09, 2013 at 08:30 PM

On top of the fact that Health is spelled wrong, you did this in update:

 function Update () 
 {
     if (Health < 0)
     (
        DIE());
 }

as far as my scripting knowledge goes, i'm pretty sure you cant use '(' and ')' to substitute for '{' and '}'.

 function Update (){
     if (Health < 0){
        DIE();
     }
 }

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Operator Cannot Be used with a left hand type 'System.type' and a right hand type 'int'

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