Check your compiler version

Oct 13, 2025 by wbrum.org 132 views

Introduction

Welcome to the world of C++ programming! As a beginner, it's essential to start with the basics, and what's more basic than the classic "Hello World" program? However, when trying to compile this program using the latest version of G++ (14.2) on Ubuntu 24.04, you might encounter some errors. Don't worry, we're here to help you troubleshoot and get your program up and running.

Understanding C++23

Before we dive into the code, let's quickly discuss what C++23 is. C++23 is the latest standard of the C++ programming language, released in 2023. It brings many new features, improvements, and bug fixes to the language. One of the significant changes in C++23 is the introduction of the std::ranges library, which provides a new way of working with ranges in C++.

The "Hello World" Code

Here's the classic "Hello World" code in C++:

#include <iostream>
int main() 
std:cout << "Hello, World!" << std::endl;
return 0;

This code is simple and straightforward. It includes the iostream header file, which provides input/output functionality, and then prints "Hello, World!" to the console using std::cout.

Compiling the Code

To compile this code, you'll need to use the G++ compiler. Here's the command you can use:

g++-14 -std=c++23 -o hello_world hello_world.cpp

Let's break down this command:

g++-14: This is the G++ compiler, version 14.2.
-std=c++23: This option tells the compiler to use the C++23 standard.
-o hello_world: This option specifies the output file name.
hello_world.cpp: This is the input file name.

Common Errors

When compiling the code, you might encounter some errors. Here are a few common ones:

Error: 'std::cout' is not a member of 'std': This error occurs when the compiler can't find the std::cout object. Make sure you've included the iostream header file.
Error: 'std::endl' is not a member of 'std': This error occurs when the compiler can't find the std::endl object. Make sure you've included the iostream header file.
Error: 'return 0' is not allowed in C++23: This error occurs when the compiler is using the C++23 standard, which doesn't allow the return 0 statement in the main function. You can simply remove this line.

Troubleshooting

If you're still encountering errors, here are a few troubleshooting steps you can try:

Check your compiler version: Make sure you're using the latest version of G++ (14.2).
Check your include files: Make sure you've included the necessary header files, such as iostream.
Check your code: Double-check your code for any syntax errors or typos.
Check your compiler flags: Make sure you're using the correct compiler flags, such as -std=c++23.

Conclusion

Compiling the "Hello World" code in C++23 can be a bit tricky, but with the right guidance, you should be able to get it up and running. Remember to include the necessary header files, use the correct compiler flags, and troubleshoot any errors that occur. Happy coding!

Additional Resources

C++23 Standard: The official C++23 standard document.
G++ Documentation: The official G++ documentation.
C++ Tutorial: A comprehensive C++ tutorial for beginners.

Example Use Cases

Here are a few example use cases for the "Hello World" code:

Console Application: You can use this code as a starting point for a console application.
GUI Application: You can use this code as a starting point for a GUI application.
Web Application: You can use this code as a starting point for a web application.

Code Snippets

Here are a few code snippets that demonstrate how to use the "Hello World" code:

Console Application:

#include <iostream>
int main() 
std:cout << "Hello, World!" << std::endl;
return 0;

GUI Application:

#include <iostream>
#include <QtWidgets>
int main() {
QApplication app(argc, argv);
QLabel label("Hello, World!");
label.show();
return app.exec();
}

Web Application:

#include <iostream>
#include <http>
int main() 
http:Server server;
server.on("/hello", [](http::Request request) {
http::Response response;
response.set_status_code(200);
response.set_body("Hello, World!");
return response;
);
server.listen(8080);
return 0;
}

Introduction

In our previous article, we discussed the common issues that may arise when compiling the "Hello World" code in C++23 using the latest version of G++ (14.2) on Ubuntu 24.04. However, we understand that sometimes, it's easier to get answers to specific questions rather than reading through a lengthy article. That's why we've created this Q&A guide to help you troubleshoot and resolve any issues you may encounter when compiling the "Hello World" code in C++23.

Q: What is C++23?

A: C++23 is the latest standard of the C++ programming language, released in 2023. It brings many new features, improvements, and bug fixes to the language.

Q: What is the difference between C++23 and C++20?

A: C++23 is the latest standard of the C++ programming language, while C++20 is the previous standard. C++23 includes many new features and improvements over C++20, such as the introduction of the std::ranges library.

Q: Why am I getting an error when compiling the "Hello World" code?

A: There are several reasons why you may be getting an error when compiling the "Hello World" code. Some common errors include:

Error: 'std::cout' is not a member of 'std': This error occurs when the compiler can't find the std::cout object. Make sure you've included the iostream header file.
Error: 'std::endl' is not a member of 'std': This error occurs when the compiler can't find the std::endl object. Make sure you've included the iostream header file.
Error: 'return 0' is not allowed in C++23: This error occurs when the compiler is using the C++23 standard, which doesn't allow the return 0 statement in the main function. You can simply remove this line.

Q: How do I troubleshoot errors when compiling the "Hello World" code?

A: Here are a few troubleshooting steps you can try:

Check your compiler version: Make sure you're using the latest version of G++ (14.2).
Check your include files: Make sure you've included the necessary header files, such as iostream.
Check your code: Double-check your code for any syntax errors or typos.
Check your compiler flags: Make sure you're using the correct compiler flags, such as -std=c++23.

Q: Can I use the "Hello World" code as a starting point for a console application?

A: Yes, you can use the "Hello World" code as a starting point for a console application. Simply modify the code to include any additional functionality you need.

Q: Can I use the "Hello World" code as a starting point for a GUI application?

A: Yes, you can use the "Hello World" code as a starting point for a GUI application. However, you'll need to modify the code to include any additional functionality you need, such as creating a GUI window and handling user input.

Q: Can I use the "Hello World" code as a starting point for a web application?

A: Yes, you can use the "Hello World" code as a starting point for a web application. However, you'll need to modify the code to include any additional functionality you need, such as creating a web server and handling HTTP requests.

Q: What are some common use cases for the "Hello World" code?

A: Some common use cases for the "Hello World" code include:

Console Application: You can use this code as a starting point for a console application.
GUI Application: You can use this code as a starting point for a GUI application.
Web Application: You can use this code as a starting point for a web application.

Q: What are some additional resources I can use to learn more about C++23?

A: Here are some additional resources you can use to learn more about C++23:

C++23 Standard: The official C++23 standard document.
G++ Documentation: The official G++ documentation.
C++ Tutorial: A comprehensive C++ tutorial for beginners.

Conclusion

We hope this Q&A guide has helped you troubleshoot and resolve any issues you may have encountered when compiling the "Hello World" code in C++23. Remember to always check your compiler version, include files, code, and compiler flags to ensure that your code is compiling correctly. Happy coding!