Working with scores – scripting with text

To display a score in the GUI, we'll first need score functionality, that is, code to create a score system. Essentially, the score functionality will be added to a general, overarching GameController class, responsible for all game-wide logic and features. The code for GameController and its score feature set is included in Code Sample 4.4, as follows. This file should be added to the Scripts folder of the project.

using UnityEngine;
using System.Collections;
using UnityEngine.UI;
//------------------------------
public class GameController : MonoBehaviour
{
  //Game score
  public static int Score;

  //Prefix
  public string ScorePrefix = string.Empty;

  //Score text object
  public Text ScoreText = null;

  //Game over text
  public Text GameOverText = null;

  public static GameController ThisInstance = null;
  //------------------------------
  void Awake()
  {
    ThisInstance = this;
  }
  //------------------------------
  void Update()...