Accessing a variable from another script C# [duplicate]

You first need to get the script component of the variable, and if they’re in different game objects, you’ll need to pass the Game Object as a reference in the inspector.

For example, I have scriptA.cs in GameObject A and scriptB.cs in GameObject B:

scriptA.cs

// make sure its type is public so you can access it later on
public bool X = false;

scriptB.cs

public GameObject a; // you will need this if scriptB is in another GameObject
                     // if not, you can omit this
                     // you'll realize in the inspector a field GameObject will appear
                     // assign it just by dragging the game object there
public scriptA script; // this will be the container of the script

void Start(){
    // first you need to get the script component from game object A
    // getComponent can get any components, rigidbody, collider, etc from a game object
    // giving it <scriptA> meaning you want to get a component with type scriptA
    // note that if your script is not from another game object, you don't need "a."
    // script = a.gameObject.getComponent<scriptA>(); <-- this is a bit wrong, thanks to user2320445 for spotting that
    // don't need .gameObject because a itself is already a gameObject
    script = a.getComponent<scriptA>();
}

void Update(){
    // and you can access the variable like this
    // even modifying it works
    script.X = true;
}