What Is String in Data Structure and Algorithm?


Larry Thompson

In the world of data structures and algorithms, a string is a fundamental concept that you will often encounter. A string is simply a sequence of characters. These characters can be letters, numbers, symbols, or even whitespace.

Strings play a crucial role in many programming languages and are used to represent text-based data. They allow us to store and manipulate words, sentences, and other forms of textual information.

Creating a String

In most programming languages, strings can be created by enclosing the desired sequence of characters within quotation marks. For example:

    String greeting = "Hello, World!";

The above code snippet creates a string variable named “greeting” and assigns it the value “Hello, World!”. The quotation marks indicate that we are dealing with a string literal.

String Operations

Once we have created a string, there are numerous operations we can perform on it. Let’s explore some of the common ones:


Concatenation is the process of combining two or more strings together. This operation is commonly used to join strings or insert variables into text.

In most programming languages, concatenation is achieved using the ‘+’ operator. Here’s an example:

    String firstName = "John";
    String lastName = "Doe";
    String fullName = firstName + " " + lastName;

In this example, we concatenate the ‘firstName’ variable with a space (” “) and the ‘lastName’ variable to create the ‘fullName’ string.


The length of a string refers to the number of characters it contains. This information is often useful when manipulating strings.

In many programming languages, the ‘length’ property or method can be used to determine the length of a string. Here’s an example:

    String message = "Hello! ";
    int length = message.length();

The ‘length’ variable will store the value 6, as the string “Hello!” contains six characters.


A substring is a portion of a larger string. It allows us to extract a specific section from within a string.

The starting and ending indices define the substring range. Here’s an example:

    String sentence = "The quick brown fox";
    String substring = sentence.substring(4, 9);

The ‘substring’ variable will store the value “quick”, as we extracted characters from index 4 (inclusive) to index 9 (exclusive) in the ‘sentence’ string.


In conclusion, strings are essential in data structures and algorithms as they provide a way to handle and manipulate textual information. Understanding how to create, concatenate, find their length, and extract substrings is crucial for effective programming.

By incorporating these string operations into your code, you can enhance your applications and solve various problems efficiently.

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