C# ARRAYS

Background

An array stores a fixed-size sequential collection of elements of the same type. An array is used to store a collection of data, but it is often more useful to think of an array as a collection of variables of the same type stored at contigeous memory locations.

using System;

namespace ConsoleApp1
{
    class MyArray
    {
        static void Main(string[] args)
        {
            int[] n = new int[10]; /* n is an array of 10 integers */
            /* initialize elements of array n */
            for (int i = 0; i < 10; i++)
            {
                n[i] = i + 100;
            }
            /* output each array element's value */
            foreach (int j in n)
            {
                int i = j - 100;
                Console.WriteLine("Element[{0}] = {1}", i, j);
                i++;
            }
            Console.ReadKey();
            //Element[1] = 101
            //Element[2] = 102
            //Element[3] = 103
            //Element[4] = 104
            //Element[5] = 105
            //Element[6] = 106
            //Element[7] = 107
            //Element[8] = 108
            //Element[9] = 109
        }
    }
}

Two-Dimensional Arrays

The simplest form of the multidimensional array is the 2-dimensional array. A 2- dimensional array is a list of one-dimensional arrays.

using System;

namespace ConsoleApp1
{
    class MyArray
    {
        public static void Main(string[] args)
        {
            /* an array with 5 rows and 2 columns*/
            int[,] a = new int[5, 2] { { 0, 0 }, { 1, 2 }, { 2, 4 }, { 3, 6 }, { 4, 8 } };
            int i, j;
            /* output each array element's value */
            for (i = 0; i < 5; i++)
            {
                for (j = 0; j < 2; j++)
                {
                    Console.WriteLine("a[{0},{1}] = {2}", i, j, a[i, j]);
                }
            }
            Console.ReadKey();
            //a[0, 0]: 0
            //a[0, 1]: 0
            //a[1, 0]: 1
            //a[1, 1]: 2
            //a[2, 0]: 2
            //a[2, 1]: 4
            //a[3, 0]: 3
            //a[3, 1]: 6
            //a[4, 0]: 4
            //a[4, 1]: 8
        }
    }
}

Jagged Arrays

A Jagged array is an array of arrays. You can declare a jagged array named scores:

using System;

namespace ConsoleApp1
{
    class MyArray
    {
        static void Main(string[] args)
        {
            /* a jagged array of 5 array of integers*/
            int[][] a = new int[][] { new int[] { 0, 0 }, new int[] { 1, 2 }, new int[] { 2, 4 }, new int[] { 3, 6 }, new int[] { 4, 8 } };
            int i, j;
            /* output each array element's value */
            for (i = 0; i < 5; i++)
            {
                for (j = 0; j < 2; j++)
                {
                    Console.WriteLine("a[{0}][{1}] = {2}", i, j, a[i][j]);
                }
            }
            Console.ReadKey();
            //a[0][0]: 0
            //a[0][1]: 0
            //a[1][0]: 1
            //a[1][1]: 2
            //a[2][0]: 2
            //a[2][1]: 4
            //a[3][0]: 3
            //a[3][1]: 6
            //a[4][0]: 4
            //a[4][1]: 8
        }
    }
}

Properties of the Array Class

The following table describes some of the most commonly used properties of the Array class

Methods of the Array Class

The following table describes some of the most commonly used methods of the Array class: