using System;


namespace labr.work.sharp
{
    class Program
    {
        static void Main(string[] args)
        {
            double[] numberer = new double[4] { 0.0, 0.0, 0.0, 0.0 };
            for (int i = 0; i < numberer.Length; i++)
            {
                numberer[i] = Convert.ToDouble(null);
                Console.WriteLine("[" + i + "] Defaulted to null");
            }
            Console.Clear();

            Console.WriteLine("Введите число:a");
            numberer[0] = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine( (Convert.ToInt32(numberer[0]) % 2) == 1 ? "неЧетное" : "Четное");

            Console.ReadKey();
            Console.Clear();

            Console.WriteLine("Введите число:a");
            numberer[1] = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Введите число:b");
            numberer[2] = Convert.ToInt32(Console.ReadLine());
            if(numberer[2] > numberer[1]) Console.WriteLine("b > a");
            else Console.WriteLine("b <= a");

            Console.ReadKey();
            Console.Clear();

            Console.WriteLine("Введите число:a");
            numberer[3] = Convert.ToDouble(Console.ReadLine());
            if (numberer[3] < Math.PI) numberer[3] = 5 - Math.Cos(numberer[3]);
            else numberer[3] = Math.Sin(numberer[3]) + 4;
            Console.WriteLine(numberer[3]);

        }
    }
}