using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main(string[] args)

    { 

        Console.WriteLine("Please uncomment a question");

    }

    //*********************

    //*** Question 1

    //*** Describe the output of this program

    //*********************

    /*

    public static void Main(string[] args)

    { 

        int[] arr = new int[] {1 ,2 ,3 ,4 ,5 };

        fun1(arr);

        Console.ReadLine();

    }

    static void fun1(int[] array)

    {

        for (int i = 0; i < array.Length; i=i+2)

        {

            array[i] = array[i] + 10;

        }

        Console.WriteLine(string.Join(",", array));

    }

    */

    //*********************

    //*** Question 2

    //*** Describe the output of this program

    //*********************

    /*

    public static void Main(string[] args)

    {

        int num = 5;

        int square = 0, cube = 0;

        Mul (num, out square, out cube);

        Console.WriteLine(square + " & " +cube);

        Console.ReadLine();

    }

    static void Mul (int num, out int square, out int cube)

    {

        square = num * num;

        cube = num * num * num;

    }

    */

    //*********************

    //*** Question 3

    //*** Write a program to check two given integers, and return true if one of them is 30 or if their sum is 30.

    //*********************

    /*

    public static void Main(string[] args)

    {

        Console.WriteLine(test(30, 0));

        Console.WriteLine(test(25, 5));

        Console.WriteLine(test(20, 30));

        Console.WriteLine(test(20, 25));

        Console.ReadLine();

    }

​

    public static bool test(int x, int y)

    {

        //code goes here

    }

    */

    //*********************

    //*** Question 4

    //*** Write a function to exchange the first and last characters in a given string and return the new string.

    //*********************

    /*

    public static void Main(string[] args)

    {

        Console.WriteLine(test("abc"));

        Console.WriteLine(test("abcdef"));

        Console.WriteLine(test("xy"));

        Console.WriteLine(test("x"));

    }

​

    public static string test(string str)

    {

        //code goes here

    }   

    */

​

    //*********************

    //*** Question 5 (LINQ)

    //*** Write a function that finds and adds all the even numbers in the array

    //*********************

    /*

    public static void Main(int[] intArray) {

        int[] arr = new int[] {1 ,2 ,3 ,4 ,5 };

        long res = TotalAllEvenNumbers(arr);

        Console.WriteLine(res);

    }

    static long TotalAllEvenNumbers(int[] intArray) {

      //code goes here

    }

    */

    //*********************

    //*** Question 6 (LINQ)

    //*** Find which numbers in the array when squared are more than 20

    //*********************

    /*

    public static void Main(string[] args)

    {

        var arr1 = new[] { 3, 9, 2, 8, 6, 5 };      

        var res = FindAllNumbers(arr1);

        Console.WriteLine(String.Join(",", res));

    }

    static List<int> FindAllNumbers(int[] intArray) {

        //code goes here

    }   

    */

​

}