Pract_6(2)

using System;
namespace car_shop
{
    class car
    {
        string brand;
        double capacity;
        double price;
        double maxspeed;
        int attribute;

        public void input(int n)
        {
            string s;
            double b, d;

            Console.WriteLine("Enter brand of  {0} car", n + 1);
            brand = Console.ReadLine();
            Console.WriteLine("Enter it is capacity");
            s = Console.ReadLine();
            capacity = Convert.ToDouble(s);
            Console.WriteLine("Enter it is price");
            b = Convert.ToInt32(Console.ReadLine());
            price = Convert.ToDouble(b);
            Console.WriteLine("Enter it is maxspeed");
            d = Convert.ToInt32(Console.ReadLine());
            maxspeed = Convert.ToDouble(d);
        }
        public void analyses(ref double desire_price, ref double desire_capacity, ref double desire_maxspeed)
        {
            if (price <= desire_price && capacity <= desire_capacity && maxspeed <= desire_maxspeed)
                attribute = 1;
        }
        public void output(int n)
        {
            if (attribute != 0)
            {
                Console.WriteLine("The car number {0} is suitable for you:", n + 1);
                Console.WriteLine("brand is '{0}' price is {1} capacity is {2} maxspeed is {3}", brand, price, capacity, maxspeed);
            }
            else
                Console.WriteLine("The {0} car is it not suitable for you ", n + 1);
        }
    }

    class Program
    {
        public static void Main(string[] args)
        {
            string s;
            double b, d;
            int count_of_cars;
            Console.WriteLine("Enter count_of_cars");
            s = Console.ReadLine();
            count_of_cars = Convert.ToInt32(s);
            car[] q = new car[count_of_cars];
            for (int i = 0; i < q.Length; i++)
            {
                q[i] = new car();
                q[i].input(i);
            }
            double desire_price;
            double desire_capacity;
            double desire_maxspeed;
            Console.WriteLine("=========:Filter:=========");
            Console.WriteLine("Enter desire capacity");
            s = Console.ReadLine();
            desire_capacity = Convert.ToDouble(s);
            Console.WriteLine("Enter desire price");
            b = Convert.ToInt32(Console.ReadLine());
            desire_price = Convert.ToDouble(b);
            Console.WriteLine("Enter desire maxspeed");
            d = Convert.ToInt32(Console.ReadLine());
            desire_maxspeed = Convert.ToDouble(d);
            for (int i = 0; i<q.Length;i++)
            {
                q[i].analyses(ref desire_capacity, ref desire_price, ref desire_maxspeed );
                q[i].output(i);

            }
            Console.WriteLine("Finish");
            Console.Write("Press any key to continue  .  .  .");
            Console.ReadKey(true);
        }
    }
}