using System;

public class Engine

{ public double volume; public int power;

 public Engine(double engineVolume, int enginePower)

 { this.volume=engineVolume;

  this.power=enginePower;

 }

}

public class Car

{public string brand;

 public string model;

 public Engine engine;

 public Car(string carBrand, string carModel, Engine carEngine)

 { this.brand=carBrand;

  this.model=carModel;

  carEngine.volume*=1000;

  this.engine=carEngine;

 }

 public void changeRef(ref Engine changeEngine)

 {Engine newEngine=new Engine(5, 600);

  changeEngine=newEngine;

 }

}

​

public class Program

{

    public static void Main()

    {

        Engine myEngine=new Engine(2.5, 180);

        Car myCar=new Car("FlyCar","Mark1",myEngine);

        Console.WriteLine(myCar.engine.volume);

        Console.WriteLine(myEngine.volume);

        Console.WriteLine("{0},{1},{2},{3}",myCar.brand, myCar.model, myCar.engine.volume, myCar.engine.power);

    }

}