Multi Dimensional Array – Learn Automation Devops

Agenda

Multi-Dimensional Array in C#

C# supports multidimensional arrays up to 32 dimensions. The multidimensional array can be declared by adding commas in the square brackets. For example, [,] declares two-dimensional array, [, ,] declares three-dimensional array, [, , ,] declares four-dimensional array, and so on. So, in a multidimensional array, no of commas = No of Dimensions - 1.
The multidimensional array is also known as rectangular arrays in C#.
The following examples declares multidimensional arrays.

int[,] array2d; // two-dimensional array

int[, ,] array3d; // three-dimensional array

int[, , ,] array4d ; // four-dimensional array

A 2-dimensional array can be thought of as a table, which has x number of rows and y number of columns. Two Dimensional Array Examples: int [,] array2 = {{1, 3, 5}, {2, 4, 6}}; int[,] array2D = new int[,] { { 1, 2 }, { 3, 4 }, { 5, 6 } }; string[,] array2Ds = new string[3, 2] { { “One", “Two" }, { “Three", “Four" }, { “Five", “Six" } };
Accessing any element in the array: Console.WriteLine(array2[0,1]);
User can update any element by updating the element value: array2[1, 1] = 12;
Length of the array can be found using: Console.WriteLine(intArray.Length);

Multi-Dimensional Array in C# - Contd.

For loop can be used to access the elements in multi-dimensional array. for (int i = 0; i < array2.GetLength(0); i++) { Console.Write("Row " + i + ": "); for (int j = 0; j < array2.GetLength(1); j++) { Console.Write(array2[i, j] + " "); } Console.WriteLine(); }
Foreach loop can be used exclusively to loop through elements in multi-dimensional array. foreach (int i in array2) { Console.WriteLine("{0} ", i); }

Multi-Dimensional Array in C# - Contd.

int[,] arr3R3C = new int[3, 3];//declaration of 2D array

arr3R3C[0, 1] = 10;//initialization

arr3R3C[1, 2] = 20;

arr3R3C[2, 0] = 30;

arr3R3C[2, 1] = 40;

arr3R3C[2, 2] = 50;

//traversal

for (int i = 0; i < 3; i++)

{

for (int j = 0; j < 3; j++)

{

Console.Write(arr3R3C[i, j] + ” “); //undefined elements will take the
default value of data type, for int default value will be 0

}

Console.WriteLine();//new line at each row

}

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

intArray[0, 1] = 12; Console.WriteLine(intArray[0,1]);

foreach (int i in intArray) { Console.WriteLine(i); }

int[,] arr3R3C = new int[3, 3];//declaration of 2D array

arr3R3C[0, 1] = 10;//initialization arr3R3C[1, 2] = 20; arr3R3C[2, 0] = 30; arr3R3C[2, 1] = 40; arr3R3C[2, 2] = 50;

//traversal for (int i = 0; i < 3; i++) { for (int j = 0; j < 3; j++) { Console.Write(arr3R3C[i, j] + " "); //undefined elements will take the default value of data type, for int it will be 0 }
Console.WriteLine();//new line at each row }

string[,] array2Db = new string[3, 2] { { "one", "two" }, { "three", "four" }, { "five", "six" } }; foreach (string s in array2Db) { System.Console.Write("{0} ", s); }

var allArrayLength = intArray.Length; var total = 1; for (int i = 0; i < intArray.Rank; i++) { total *= intArray.GetLength(i); }
System.Console.WriteLine("{0} equals {1}", allArrayLength, total);

for (int i = 0; i < intArray.GetLength(0); i++) { Console.Write("Row " + i + ": ");

for (int j = 0; j < intArray.GetLength(1); j++) { Console.Write(intArray[i, j] + " ");

} Console.WriteLine();

} int[,] array2D = new int[,] { { 10, 2 }, { 3, 4 }, { 5, 7 } };

foreach (int i in array2D) { System.Console.Write("{0} ", i); }