Welcome to the "String Handling in STL" section of the "STL Library" lesson!

As a senior engineer interested in networking and engineering in C++ as it pertains to finance, working with strings using the STL library is an important skill to have.

The STL library provides several classes and functions for string handling, making it easier and more efficient to work with strings in C++.

Let's take a look at an example:

1#include <iostream>
2#include <string>
3
4int main() {
5    std::string message = "Hello, world!";
6
7    // Accessing individual characters
8    std::cout << message[0] << std::endl;
9
10    // Modifying characters
11    message[7] = ',';
12
13    // Finding the length
14    std::cout << message.length() << std::endl;
15
16    // Concatenating strings
17    std::string greeting = "Greetings";
18    message = greeting + " from C++!";
19
20    // Finding substrings
21    std::string substring = message.substr(0, 5);
22    std::cout << substring << std::endl;
23
24    return 0;
25}

In this example, we have a string message initialized with the value "Hello, world!". We can access individual characters of the string using the indexing operator [] and modify characters by assigning a new value.

The length() function gives us the length of the string, and we can concatenate strings using the + operator.

Additionally, the substr() function allows us to extract substrings from a string by providing the starting index and the length of the substring.

By leveraging these string handling capabilities provided by the STL library, you can perform various operations on strings with ease and efficiency.

Now that we have covered string handling using the STL library, let's move on to the next topic: the STL Time Library.

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#include <iostream>

#include <string>

​

int main() {

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

​

    // Accessing individual characters

    std::cout << message[0] << std::endl;

​

    // Modifying characters

    message[7] = ',';

​

    // Finding the length

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

​

    // Concatenating strings

    std::string greeting = "Greetings";

    message = greeting + " from C++!";

​

    // Finding substrings

    std::string substring = message.substr(0, 5);

    std::cout << substring << std::endl;

​

    return 0;

}