using System;

namespace ConsoleApp6
{
    class Program
    {
        static double foo(double x)
        {
            return x * x - 2 * x - 2 * Math.Cos(x);
        }
        static void Main(string[] args)
        {
            double masheps = 1;
            while (1 + masheps > 1)
                masheps = masheps / 2;
            masheps = Math.Sqrt(masheps);
            double a = -0.5;
            double b = 1;
            double L = a + b;
            //=================================================================
            // Шаг 2
            double x0 = 1.0 / (2.0 * L) * (foo(a) - foo(b) + L*(a+b));
            double y0 = 0.5 * (foo(a) + foo(b) +L* (a - b)) ;
            double phiMin = y0;
            // Шаг 3
            var i = 0;
            do
            {
                double delta = 1.0 / (2.0 * L) * (foo(x0) - phiMin);

                // Шаг 4


                if (2 * L * delta < masheps)
                {

                    //  Console.WriteLine(delta);
                    Console.WriteLine(x0);
                    Console.WriteLine(foo(x0));
                    Console.ReadLine();

                }
                else
                {
                //шаг 5
                double x1L = x0 - delta;
                double x1R = x0 + delta;
                double phi = 1.0 / 2.0 * (foo(x0) + phiMin);
                //шаг 6
                if (foo(x1L) < foo(x1R))
                {
                    x0 = x1L;

                }
                else
                {
                    x0 = x1R;

                }
                phiMin = phi;
                i++;
                }
            } while (i<35);


            Console.ReadKey();

        }
    }
}