"Method must have a return type"

The error says

"Method must have a return type" Around the AddX and MinusX. Above the Add and Minus I have the code that is meant to update in realtime the position of the object. Where it gives me 2 errors on all 3 lines of code. It says "Invalid token '=' in class, struct, or interface member declaration" In the same line it says "Invalid token '(' in class,struct, or interface member declaration"

Aside from my main question if anyone knows how I can have the player select an object when he looks at it please let me know!

using System.Collections; using UnityEngine; using UnityEngine.UI;

 public class Forge_Menu : MonoBehaviour {
 
     public int x;
     public int y;
     public int z;
     public Text XCurrent;
     public Text YCurrent;
     public Text ZCurrent;
     public GameObject Selected;
 
     void Start () {
         x = PlayerPrefs.GetFloat ("ObjectX", transform.position.x);
         y = PlayerPrefs.GetFloat ("ObjectY", transform.position.y);
         z = PlayerPrefs.GetFloat ("ObjectZ", transform.position.z);
     }
 
     void Update () {
         if (PlayerPrefs.GetInt ("ObjectX") != x) {
             PlayerPrefs.SetInt ("ObjectX", x);
             PlayerPrefs.Save ();
             Debug.Log ("Save completed. X = " + x);
         }
         if (PlayerPrefs.GetInt ("ObjectY") != y) {
             PlayerPrefs.SetInt ("ObjectY", y);
             PlayerPrefs.Save ();
             Debug.Log ("Save completed. Y = " + y);
         }
         if (PlayerPrefs.GetInt ("ObjectZ") != z) {
             PlayerPrefs.SetInt ("ObjectZ", z);
             PlayerPrefs.Save ();
             Debug.Log ("Save completed. Z = " + z);
         }
         transform.Translate (x, y, z);
     }
 
     XCurrent.Text = x.ToString();
     YCurrent.Text = y.ToString();
     ZCurrent.Text = z.ToString();
 
     public AddX(){
         x++
     }
 
     public MinusX(){
         x--
     }
 
     public AddY(){
         y++
     }
 
     public MinusY(){
         x--
     }    
 
     public AddZ(){
         z++
     }
 
     public MinusZ(){
         z--
     }
 }