Arrays and Strings in C#

1Working with Arrays and Strings

Hi friends, in this article we will learn about arrays and strings in C#. An array stores multiple values of the same data type in one variable. A string stores text. We use arrays to manage collections such as student marks, product prices and employee names. Strings help us work with names, messages and other text. Let's understand how to create, access and process them using C#.

2Think About a Student List

Imagine a school maintaining a list of student names. Instead of creating separate variables for every student, we can store all names inside one array.

Each student has a position called an index. The first position is index 0. A student's name is text, so each value is a string. We can also find the number of students using the array's Length property.

3Important Things to Understand

1. Declaring an Array

Use the data type followed by square brackets. For example, int[] marks creates an integer array variable.

2. Accessing Array Elements

Use the index to read or update a value. Remember, array indexing starts from zero.

3. Array Length

The Length property gives the total number of elements in an array.

4. Working with Strings

A string is a sequence of characters. Common properties and methods include Length, ToUpper() and ToLower().

4Let's Write the C# Program

We will create a student array and perform a few string operations.

using System;

class Program
{
    static void Main()
    {
        string[] students = { "Asha", "Ravi", "Meena" };

        Console.WriteLine("First student: " + students[0]);
        Console.WriteLine("Total students: " + students.Length);

        string message = "Hello C#";
        Console.WriteLine("Message: " + message);
        Console.WriteLine("Length: " + message.Length);
        Console.WriteLine("Uppercase: " + message.ToUpper());
    }
}

5What Does the Program Print?

The first array item is Asha. The message contains eight characters, including the space.

First student: Asha
Total students: 3
Message: Hello C#
Length: 8
Uppercase: HELLO C#

6Watch Arrays and Strings in Action

See how the program reads an array item, checks its length and processes a string.

7Quick Revision

Arrays store multiple values of the same type. Strings store text and provide useful methods for processing it. Both are widely used in everyday application development.

• Array indexes start from zero.
• Use Length to find the number of elements or characters.
• Use string methods to transform text.

8Questions Interviewers May Ask