using System;

​

public class Program

{

    public static Func<int, string> method1 = (x) => (x*3).ToString();

    public static Func<int, string> method2 = new Func<int, string>(DoSomething);

    public static void Main()

    {

        var result1 = method1.Invoke(2);

        Console.WriteLine(result1);

        ExecuteMethod(method2, 2);

        ExecuteMethods(method2, 1,2,3,4,5,6,7,8,9,10);

    }

    public static string DoSomething(int number){

        return (number*5.7).ToString();

    }

    public static void ExecuteMethod(Func<int, string> func, int number)

    {

        Console.WriteLine(func.Invoke(number));

    }

    public static void ExecuteMethods(Func<int, string> func, params int[] numbers)

    {

        foreach(var n in numbers)

        {

            Console.WriteLine(func.Invoke(n));

        }

    }

}