using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _2015_C_sharp_Exam
{
    class Program
    {

        /*
            arrays are passed to methods  by reference that
            means that the actual values in the array will
            change, not just in the method, so I created a new
            array called copy, and copied the values of the
            array to it, because I don't want the default values
            of the array to change because it will be used later
            in another method ( SubtractTen() )
         */
        static void MultiblyByFive(int[] arr)
        {
            int[] copy = new int[arr.Length];

            for (int i = 0; i < arr.Length; i++)
            {
                Console.Write(arr[i] + " ");
                copy[i] = arr[i];
            }

            for (int i = 0; i < copy.Length; i++)
            {
                copy[i] *= 5; //arr[i] = arr[i] * 5;
            }

            Console.WriteLine();

            for (int i = 0; i < arr.Length; i++)
            {
                Console.Write(copy[i] + " ");
            }

            Console.WriteLine();
        }

        static void SubtractTen(int[] arr)
        {

            Console.WriteLine(arr[2]);

            arr[2] -= 10;

            Console.WriteLine(arr[2]);
        }

        static void Main(string[] args)
        {
            //Question 3 - b

            Console.Write("Enter the size of the array : ");

            int size = int.Parse(Console.ReadLine());

            int[] arr = new int[size];

            Console.WriteLine("Enter the array elements : ");

            for (int i = 0; i < size; i++)
            {
                arr[i] = int.Parse(Console.ReadLine());
            }

            Console.WriteLine("Default array and after multiblying by five : ");

            MultiblyByFive(arr);

            Console.WriteLine("Default third element value and after subtracting 10 :");

            SubtractTen(arr);
        }
    }
}