using System;

public class Program

{

    public static void Main()

    {

        // Action is an in-built delegate that takes 0 to n arguments and does not return anything (void type).

        Action actionDelegateGreet = () => {

            Console.WriteLine("Hello Boss!");

        };

        actionDelegateGreet();

        // Func takes 0 to n arguments and always returns a value. The main difference between Action and Func is, Func always returns the value.

        Func<int,int,int> functonDelegateSum = (x, y) => x + y;     

        Console.WriteLine(functonDelegateSum(3,5));

        // Predicate delegate takes only 1 arguments and returns a boolean value.

        Predicate<int> predicateDelegateIsEven = (n) => n%2 == 0 ;

        int[] nums = {1,2,3,4,5,6};

        foreach(var num in nums)

        {

            Console.WriteLine(predicateDelegateIsEven(num));

        }

    }

}