using System;

public class Program

{

    public static void Main()

    {

        Car<int> c = new (1, "Honda", 20.99);

        Console.WriteLine(c.id);

        Console.WriteLine(c.name);

        Console.WriteLine(c.price);

    }

}

​

class Car<T>

{

    public T id;

    public string name;

    public double? price;

    public Car(T id, string name, double price)

    {

        this.id = id;

        this.name = null;

        this.price = null;

    }

}