Arrays in C#

In this tutorial, we will learn about arrays in C#. We will cover the basics of declaring and using arrays, including accessing and modifying elements.

What is an Array

An array is a collection of elements of the same type stored in contiguous memory locations. It allows you to store multiple items under a single name and access them using an index.

An array of integers

Syntax

The syntax to declare an array in C# is:

type[] arrayName = new type[arraySize];

Working with Arrays

We will learn how to declare, initialize, access, and modify arrays in C#.


Example 1: Declaring and Initializing an Array

  1. Declare an integer array named arr with 5 elements.
  2. Initialize the array with values {1, 2, 3, 4, 5}.
  3. Print all the elements of the array.

C# Program

using System;
class Program {
    static void Main() {
        int[] arr = {1, 2, 3, 4, 5};
        foreach (int num in arr) {
            Console.Write(num + " ");
        }
    }
}

Output

1 2 3 4 5

Example 2: Accessing Array Elements

  1. Declare an integer array named arr with 5 elements.
  2. Initialize the array with values {10, 20, 30, 40, 50}.
  3. Access and print the third element of the array.

C# Program

using System;
class Program {
    static void Main() {
        int[] arr = {10, 20, 30, 40, 50};
        Console.WriteLine("The third element is: " + arr[2]);
    }
}

Output

The third element is: 30

Example 3: Modifying Array Elements

  1. Declare an integer array named arr with 5 elements.
  2. Initialize the array with values {5, 10, 15, 20, 25}.
  3. Modify the second element of the array to 50.
  4. Print all the elements of the array.

C# Program

using System;
class Program {
    static void Main() {
        int[] arr = {5, 10, 15, 20, 25};
        arr[1] = 50;
        foreach (int num in arr) {
            Console.Write(num + " ");
        }
    }
}

Output

5 50 15 20 25