Main_1_2

using System;


class Program
{
    public static readonly Func<double, double> Function1 = x
        => 3 * Math.Pow(x, 4) + Math.Pow(x - 1, 2);
    public static readonly Func<double, double> Function2 = x
        => Math.Pow(x, 3) * Math.Sin(x);

    public static void Main()
    {
        // double.TryParse(Console.ReadLine(), out double a);
        // double.TryParse(Console.ReadLine(), out double b);
        Console.WriteLine("***Dichotomy method***\n");
        (double end, double start) interval = new DichotomyMethod().FindRoot(Function2, 0, 6);
        var x = (interval.start + interval.end) / 2;

        Console.WriteLine($"Interval: {interval}");
        Console.WriteLine($"Root: {x}");
        Console.WriteLine($"Value in root: {Function2(x)}");

        Console.WriteLine("\n\n***Golden section method***\n");
        var goldenSectionMethod = new GoldenSectionMethod(Function2);
        var y = goldenSectionMethod.FindMin(0, 6);
        Console.WriteLine("Root: " + y);
        Console.WriteLine($"Value in root: {Function2(y)}");
    }
}