Online C++ Playground

Practice Now


The LabEx platform provides a C++ Playground environment where users can quickly experience C++ related technologies. The C++ Playground offers a convenient and interactive way to explore and learn C++ programming without the need for local setup.

Skills Graph

%%%%{init: {'theme':'neutral'}}%%%% flowchart RL cpp(("`C++`")) -.-> cpp/BasicsGroup(["`Basics`"]) cpp/BasicsGroup -.-> cpp/variables("`Variables`") subgraph Lab Skills cpp/variables -.-> lab-372911{{"`Online C++ Playground`"}} end

How to Use the C++ Playground

The C++ Playground runs on the Ubuntu 22.04 operating system. To get started, you can create a "Hello World" C++ project in the Playground, which will help you quickly understand how to experience the C++ Playground.

Here are the steps to create a "Hello World" project in the C++ Playground:

  1. VS Code Interface: The C++ Playground provides a VS Code-based interface. You can open the VS Code interface and create a new C++ file. Write the "Hello World" code in the file and save it. Then, you can compile and run the code to see the output.
  2. Desktop Interface: The C++ Playground also offers a desktop-based interface. In this interface, you can find the necessary tools and utilities to write, compile, and run C++ code, including a terminal, text editor, and compiler.
  3. Web Terminal Interface: Additionally, the C++ Playground provides a web-based terminal interface. In this interface, you can directly interact with the Ubuntu environment and run C++ commands, including compiling and executing the "Hello World" program.


Here is an example of a "Hello World" C++ program that you can run in the C++ Playground:

#include <iostream>

int main() {
    std::cout << "Hello, World!" << std::endl;
    return 0;

In the terminal:

g++ hello.cpp -o hello

The LabEx Online C++ Playground is a powerful tool for C++ enthusiasts. The screenshot below shows how to use the VS Code Interface within the C++ Playground to implement the example mentioned above. You can see the full IDE support for writing code, compiling C++, and running tests.

C++ Playground

C++ Skill Tree on LabEx

The C++ Skill Tree on LabEx is structured into several skill groups, each containing specific skills. Here’s an organized overview:


Foundational concepts:

  • Syntax: Basic structure and commands.
  • Data Types: Understanding int, char, float, etc.
  • Operators: Arithmetic, logical, and relational operators.
  • Control Structures: If statements, loops, and switch cases.
  • Functions: Writing reusable code blocks.
  • Variables: Declaration and scope.
  • Comments: Annotating code.

OOP (Object-Oriented Programming)

Core OOP principles:

  • Classes and Objects: Defining and using classes.
  • Constructors: Initializing class objects.
  • Encapsulation: Bundling data and methods in a class.
  • Inheritance: Classes inheriting properties and methods from other classes.
  • Polymorphism: Treating objects of different classes as objects of a common base class.

Advanced Concepts

Advanced topics like pointers, references, structures, exceptions, and templates:

  • Pointers: Variables storing memory addresses.
  • References: Alternative ways to alias variables.
  • Structures: User-defined data types with different members.
  • Exceptions: Handling runtime errors.
  • Templates: Generic programming for functions and classes.

I/O and File Handling

Input and output operations, including console output, user input, and file handling:

  • Output: Displaying data using cout.
  • User Input: Accepting data from users using cin.
  • Files: Reading from and writing to external files.

Standard Library

Pre-defined functions, containers, and algorithms:

  • Math: Mathematical functions and constants.
  • String Manipulation: Functions for working with strings.
  • Standard Containers: Data structures like vectors, lists, and maps.

Syntax and Style

Coding style and conventions, including comments and formatting:

  • Comments: Notes within code for better understanding.
  • Code Formatting: Consistent style and indentation for readability.

For hands-on labs and more detailed learning, visit the C++ Skill Tree.

C++ Playground FAQ

What are the advantages of using C++ over other languages?

C++ offers a blend of performance, efficiency, and control over system resources, making it ideal for system/software development, game programming, and real-time applications.

Why use an Online C++ Playground?

An online C++ Playground allows you to practice C++ programming without setting up a local development environment. It provides a ready-to-use platform to write, compile, and run C++ code instantly.

How does the LabEx C++ Playground differ from other online C++ compilers?

The LabEx C++ Playground provides a comprehensive online lab environment with multiple interfaces (VS Code, Desktop, Web Terminal). It supports full-fledged development, including compiling and running complete web and desktop client projects.

Can I use the C++ Playground for professional development?

Yes, the C++ Playground is equipped with all the necessary tools and environments for professional development, enabling you to work on complex projects online.

Is the C++ Playground suitable for beginners?

Absolutely! The C++ Playground is designed to cater to both beginners and advanced users, offering an intuitive interface and comprehensive resources for learning and practicing C++.


The LabEx C++ Playground provides a convenient and interactive environment for users to quickly experience C++ programming. With the three different user interfaces (VS Code, Desktop, and Web Terminal), users can choose the most suitable option to explore and learn C++ according to their preferences and needs. Whether you're a beginner looking to practice C++ online or an experienced developer in need of an online C++ compiler, the LabEx C++ Playground has you covered.

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