using System;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        //declaring array

        int[] myArray = new int[5];

        myArray[0] = 23;

        //providing initial values

        string[] names = new string[4] {"Irena", "Tomek", "Tymon", "Pola"};

        int[] years = new int[4] {36, 36, 8,2};

        //omitting size declaration

        string[] cars_owned = new string[] {"Fiat Uno", "Chevrolet Aveo"};

        double[] km_done = new double[] {12400, 156000};

        //omitting new operator

        string[] companies = {"Polmarco", "Anmar", "BBK"};

        double[] numbers = {3.14, 2.72};

        //array length

        Console.WriteLine(companies.Length);

        //accesing array elements

        Console.WriteLine(names[0]);

        Console.WriteLine(cars_owned[0]);

        Console.WriteLine(companies[2]);

        //arrays and loops

        //populating array

        int[] some_numbers = new int[5];

        for (int index = 0;index < 5; index++)

        {

            some_numbers[index] = index * 2;

        }

        //reading array

        for (int i = 0; i < 5; i++)

        {

            Console.WriteLine(some_numbers[i]);

        }

        //foreach to read array

        foreach (int x in some_numbers)

        {

            Console.WriteLine(x);

        }

        //foreach to count sum 

        double suma = 0;

        foreach (double x in numbers)

        {

            suma += x;

        }

        Console.WriteLine(suma);

        //multidimensional arrays

        int[,] multiplying_table = new int[10,10];

        int rows = multiplying_table.GetLength(0); //number of elemnts of 1st dimension

        int cols = multiplying_table.GetLength(1); //number of elements of 2nd dimension

        for (int row = 0; row < rows; row++)

        {

            for (int column = 0; column < cols; column++)

            {

                multiplying_table[row, column] = (row + 1) * (column + 1);

            }

        }

        Console.WriteLine(multiplying_table[7,8]);

        Console.WriteLine(multiplying_table[5,6]);

        //jagged array = array of arrays

        int [][] jagged = new int[3][];

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

        jagged[0] = new int[] {1,2};

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

        Console.WriteLine(jagged[0].Length); //number of elements

        Console.WriteLine(multiplying_table.Rank); // number of dimensions

        //array methods - max, min, sum

        int maximum = jagged[1].Max();

        Console.WriteLine(maximum);

        int indexOfMax = Array.IndexOf(jagged[1],maximum);

        Console.WriteLine(indexOfMax);

        int minimum = jagged[2].Min();

        Console.WriteLine(minimum);

        int indexOfMin = Array.IndexOf(jagged[2],minimum);

        Console.WriteLine(indexOfMin);

        int sumj = jagged[2].Sum();

        Console.WriteLine(sumj);

        int [] the_array = new int[10];

        for (int i = 0; i < 10; i++)

        {

            the_array.SetValue( i * i, i);

        }

        Console.WriteLine(the_array[2]);

        Array arr2 = Array.CreateInstance(typeof(String), 3);

        arr2.SetValue("tygrys",0);

        arr2.SetValue("groch", 1);

        arr2.SetValue("cukier",2); 

        //reverse

    double[] numbersx = {3.1416, 2.72, 3.28, Math.Sqrt(2), 0.01, -1.54};

    printArray(numbersx);

    Array.Reverse(numbersx);

    printArray(numbersx);

    //sort

    Array.Sort(numbersx);

    printArray(numbersx);

    }

    public static void printArray(Array the_array) {

                int length = the_array.Length;

                for (int i = 0; i < length; i++)

                {

                    Console.WriteLine("Index [{0}]:\t{1}", i, the_array.GetValue(i));

                }

            }

}