Part- 20 Jagged arrays & Passing arrays to function

 Jagged array is known as "array of arrays". Jagged array can be different dimensions and sizes. The  Jagged array element size can be different. A jagged array is initialized with two square brackets [][]. 

• The first bracket rows  specifies has to provide size of an array, and 
• The second bracket columns  specifies the dimensions of the array which is going to be stored.

 The rows are fixed in size. But columns are not specified as they can vary.

  

           int[][] jagged_array = new int[4][]

Example :

        int [ ] [ ] jagged_array = new int[2] [ ];// Declare the array  
        arr [0] = new int [ ] { 1, 2, 3, 4 };// Initialize the array          
        arr [1] = new int [ ] { 1, 2, 3, 4, 5, 6, 7 };  

// Jagged Array with Single Dimensional Array.

int[][] jagged_array = new int[3][];

jagged_array [0] = new int[5] { 1, 2, 3, 4, 5 };

jagged_array [1] = new int[3] { 10, 20, 30 };

jagged_array [2] = new int[] { 12, 50, 60, 70, 32 };

// Jagged Array with Two Dimensional Array.

int[][,] jagged_array = new int[3][,];

jagged_array [0] = new int[2, 2] { { 1, 24 }, { 2, 54 } };

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

jagged_array [2] = new int[4, 3];

 // Initialize the jagged array while declaration.

    int[][] jagged_array = new int[2][]{

                new int[3]{1, 2, 3},

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

Example :

 class JaggaryArray
    {
        static void Main(string[] args)
        {
            //jagged array of 5 array of integers
            int[ ][ ] a = new int[ ][ ]
            {
             new int[ ] {0, 0},
             new int[ ] {1, 2},
             new int[ ] {2, 4, 2},
             new int[ ] {3, 6},
             new int[ ] {4, 8}
            };
            int i, j;

            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();
        }
    }

Output

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

Passing arrays to function:

If you observe above result, methods are able accept array as a parameter to perform 
required operations based on our requirements.

class ArrayExample  
{  
    static void printArray(int[] arr)  
    {  
        Console.WriteLine("Printing array elements:");  
        for (int i = 0; i < arr.Length; i++)  
        {  
              Console.WriteLine(arr[i]);  
        }  
    }  
    public static void Main(string[] args)  
    {  
        int[] arr1 = { 5, 10, 20, 25, 30, 35 };
        printArray(arr1);//passing array to function  
        
    }  
}