Section 4: Bonus Challenge

Write C# scripts for these coding challenges.

31. Implement an abstract class Enemy with an Attack() method.

Answer

abstract class Enemy {
    public abstract void Attack();
}

class Zombie : Enemy {
    public override void Attack() {
        Console.WriteLine("Zombie bites!");
    }
}

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32. Write a static class for mathematical utilities.

Answer

static class MathUtils {
    public static double GetCircleArea(double radius) {
        return Math.PI * radius * radius;
    }
}

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33. Create an event system in Unity.

Answer

public delegate void GameEvent();
public static event GameEvent OnGameStart;

void Start() {
    OnGameStart?.Invoke();
}

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34. Write a coroutine in Unity.

Answer

IEnumerator DelayedMessage() {
    yield return new WaitForSeconds(3);
    Debug.Log("3 seconds later...");
}

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35. Implement a basic AI behaviour in Unity.

Answer

public class EnemyAI : MonoBehaviour {
    public Transform target;

    void Update() {
        transform.position = Vector3.MoveTowards(transform.position, target.position, 2f * Time.deltaTime);
    }
}

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36. Write a method to read froom a file.

Answer

string path = "Assets/textfile.txt";
string content = File.ReadAllText(path);
Console.WriteLine(content);

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37. Implement an interface in C#.

Answer

interface IWeapon {
    void Attack();
}

class Sword : IWeapon {
    public void Attack() {
        Console.WriteLine("Swinging sword!");
    }
}

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38. Write a LINQ query to filter a list.

Answer

List<int> numbers = new List<int> {1, 2, 3, 4, 5};
var evenNumbers = numbers.Where(n => n % 2 == 0);

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39. Implement a generic method in C#.

Answer

public static T GetMax<T>(T a, T b) where T : IComparable {
    return a.CompareTo(b) > 0 ? a : b;
}

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40. Create a Unity script for a simple player controller.

Answer

public class PlayerController : MonoBehaviour {
    public float speed = 5f;

    void Update() {
        float moveX = Input.GetAxis("Horizontal") * speed * Time.deltaTime;
        float moveY = Input.GetAxis("Vertical") * speed * Time.deltaTime;
        transform.Translate(moveX, moveY, 0);
    }
}