What Are Strings in Data Structure?


Scott Campbell

What Are Strings in Data Structure?

A string is a sequence of characters, which can be letters, numbers, or symbols. In data structures, a string is considered as a linear data structure since it has a sequence of elements arranged in a specific order.

Characteristics of Strings

  • Immutable: Strings are immutable, meaning they cannot be changed once created. However, you can create new strings by concatenating or modifying existing strings.
  • Sequential: The characters in a string are stored in a sequential manner, with each character having an index starting from 0.
  • Dynamically Sized: Strings can have different lengths, ranging from empty strings to very long strings.

String Operations

Strings support various operations that allow manipulation and processing of the characters within them. Some common operations include:


You can concatenate two or more strings together using the concatenation operator (+). For example:

string1 = "Hello"
string2 = "World"
concatenated_string = string1 + " " + string2

This will output: Hello World.


You can determine the length of a string using the built-in len() function. It returns the total number of characters in the string. For example:

string = "Hello World"
length = len(string)

This will output: 11.

Accessing Characters

You can access individual characters in a string by using indexing. The index starts from 0 for the first character and increments by 1 for each subsequent character. For example:

string = "Hello World"
first_character = string[0]
last_character = string[-1]
print(first_character, last_character)

This will output: H d.

String Manipulation

Strings also provide various methods for manipulation, such as:

Changing Case

You can change the case of a string using the lower() and upper() methods. For example:

string = "Hello World"
lowercase_string = string.lower()
uppercase_string = string.upper()
print(lowercase_string, uppercase_string)

This will output: hello world HELLO WORLD.


Slicing allows you to extract a portion of a string. You can specify the start and end indices to extract a substring. For example:

string = "Hello World"
substring = string[6:11]

This will output: World.

Finding Substrings

You can check if a substring exists within a string using the in operator. It returns True if the substring is found and False otherwise. For example:

string = "Hello World"
contains_hello = "Hello" in string
contains_hi = "Hi" in string
print(contains_hello, contains_hi)

This will output: True False.


Strings are an essential data type in data structures. They allow us to store and manipulate sequences of characters. Understanding the characteristics and operations of strings is crucial for working with textual data effectively.

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