C# - Jagged Arrays


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

int [][] scores;

Declaring an array, does not create the array in memory. To create the above array:

int[][] scores = new int[5][];
for (int i = 0; i < scores.Length; i++) 
{
   scores[i] = new int[4];
}

You can initialize a jagged array as:

int[][] scores = new int[2][]{new int[]{92,93,94},new int[]{85,66,87,88}};

Where, scores is an array of two arrays of integers - scores[0] is an array of 3 integers and scores[1] is an array of 4 integers.

Example

The following example illustrates using a jagged array:

using System;
namespace ArrayApplication
{
   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();
      }
   }
}

When the above code is compiled and executed, it produces the following result:

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

csharp_arrays.htm

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