A string represents a sequence of characters and is fundamental for storing textual information in programming languages like Python, Java, and C++.

Key Characteristics

• Character Encoding: Strings use encodings like ASCII, UTF-8, or UTF-16, setting rules for character representation.

• Mutability: A string’s content can be either mutable (modifiable) or immutable (unchangeable). The mutability often varies across languages.

Common Operations on Strings

• Concatenation: Joining two or more strings.
• Access: Retrieving characters using an index.
• Length: Measuring the number of characters.
• Substrings: Extracting portions of the string.

Implementations in Different Languages

Python

Strings in Python are sequences of Unicode characters and are immutable. Python offers a rich set of methods for string manipulation.

s = "Hello, World!"
print(s[0])  # Output: "H"

Java

Strings in Java are immutable sequences of characters. For efficiency, Java often stores its strings in a “string constant pool.”

String s = "Hello, World!";
System.out.println(s.charAt(0));  // Output: "H"

C/C++

In C, strings are represented using null-terminated character arrays. C++ provides both C-style strings and a more advanced std::string class.

#include <string>
std::string s = "Hello, World!";
std::cout << s[0];  // Output: "H"