String Manipulation

String manipulation refers to the process of performing operations on strings, such as accessing individual characters, finding substrings, concatenating strings, and more. In C++, the std::string class provides a convenient way to work with strings.

To start with string manipulation in C++, first, include the <string> library. Here's an example program that demonstrates some common string operations:

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In this example:

• We create a string variable message and initialize it with the value "Hello, world!"
• We use the length() function to get the length of the string and print it
• We access individual characters of the string using the indexing operator ([])
• We append another string to message using the += operator
• We find a substring (word) within another string (sentence) using the find() function and print the index where it is found

You can run the above program and observe the output to see the results of these string operations. Feel free to experiment and modify the code to further explore string manipulation in C++.

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}

#include <iostream>

#include <string>

​

int main() {

  // Create a string variable

  std::string message = "Hello, world!";

​

  // Print the length of the string

  std::cout << "Length: " << message.length() << std::endl;

​

  // Access individual characters

  std::cout << "First character: " << message[0] << std::endl;

  std::cout << "Last character: " << message[message.length() - 1] << std::endl;

​

  // Append to the string

  std::string name = "Alice";

  message += " My name is " + name;

  std::cout << "Updated message: " << message << std::endl;

​

  // Find substrings

  std::string sentence = "This is a sentence.";

  std::string word = "sentence";

  size_t found = sentence.find(word);

  if (found != std::string::npos) {

    std::cout << "Word found at index: " << found << std::endl;

  } else {

    std::cout << "Word not found." << std::endl;

  }

​