1. The methods getModelYear and getFuel are getter methods. They take no arguments, are public, and only return a value.
2. The method addFuel is a setter method. It is public and takes one float argument called fuel. For updating the value of the fuel you might need to use this keyword. (this.fuel += fuel)

using System;

class Vehicle
{
    // Edit code below this line
    private string type;
    private int modelYear;
    // Edit code above this line

    // Create a method below this line
    public int getModelYear()
    {
        return modelYear;
    }
    // Create a method above this line

    public Vehicle(string type, int modelYear)
    {
        this.type = type;
        this.modelYear = modelYear;
    }
}

class Car : Vehicle
{
    // Edit code below this line
    public string brandName;
    public string numberPlate;
    private string ownerName;
    private float fuel;
    // Edit code above this line

    // Create a method below this line
    public float getFuel()
    {
        return fuel;
    }

    public void addFuel(float fuel)
    {
        this.fuel += fuel;
    }
    // Create a method above this line

    public Car(int modelYear, string brandName, string numberPlate, string ownerName, float fuel) : base("Car", modelYear)
    {
        this.brandName = brandName;
        this.numberPlate = numberPlate;
        this.ownerName = ownerName;
        this.fuel = fuel;
    }
}

class Program
{
    static void Main()
    {
        // Create an instance of Car
        Car myCar = new Car(2022, "Toyota", "ABC123", "John Doe", 50.0f);

        // Accessing properties and methods from Car class
        Console.WriteLine($"Brand: {myCar.brandName}");
        Console.WriteLine($"Number Plate: {myCar.numberPlate}");

        // Accessing getModelYear method from Vehicle class
        Console.WriteLine($"Model Year: {myCar.getModelYear()}");

        // Accessing getFuel method from Car class
        Console.WriteLine($"Fuel: {myCar.getFuel()}");

        // Adding fuel using addFuel method
        myCar.addFuel(10.0f);
        Console.WriteLine($"After adding fuel, new Fuel: {myCar.getFuel()}");
    }
}