Online C++ Compiler

Write and run C++ code directly in your browser with this free online compiler. C++ is a powerful, high-performance language that extends C with object-oriented features, generic programming, and the Standard Template Library. It is used in game engines, operating systems, browsers, and any application where speed and efficiency matter. This compiler lets you execute C++ programs instantly without any installation.

What is C++?

C++ is a general-purpose programming language created by Bjarne Stroustrup in 1985 as an extension of C. It adds classes, templates, exceptions, namespaces, operator overloading, and many other features to the C language. C++ supports multiple paradigms including procedural, object-oriented, and generic programming. It is one of the most widely used languages for performance-critical software, from game engines to database systems.

Key Features

• Object-Oriented: Classes, inheritance, polymorphism, and encapsulation.
• Templates: Generic programming for type-safe, reusable code.
• STL: Built-in containers like vector, map, and set.
• RAII: Resource management through object lifetimes.
• Zero-Cost Abstractions: High-level features with no runtime overhead.

Basic C++ Syntax

#include <iostream>
#include <vector>
#include <string>
using namespace std;

// Class definition
class Developer {
public:
    string name;
    Developer(string n) : name(n) {}
    void greet() {
        cout << "Welcome, " << name << "!" << endl;
    }
};

int main() {
    // Variables
    string site = "LabsICT";
    int year = 2025;

    // STL vector and loop
    vector<string> languages = {"C++", "Python", "Java"};
    for (const auto& lang : languages) {
        cout << "Learn " << lang << " at " << site << endl;
    }

    // Object usage
    Developer dev("Bilal");
    dev.greet();

    return 0;
}

What Can You Build with C++?

C++ is the language behind performance-critical software. Game engines like Unreal Engine, Unity (partially), and Godot use C++ for core rendering and physics. Web browsers like Chrome and Firefox have C++ components. Operating systems, database engines (MySQL, MongoDB), compilers, and embedded systems all rely on C++. It is also used in high-frequency trading, scientific simulations, robotics, and aerospace applications where every microsecond counts.

Try It Yourself

Type your C++ code in the editor and click Run. The compiler supports modern C++ features including STL containers, lambdas, auto type deduction, range-based for loops, and classes. Use Copy to save, Reset to restore the example, and Share to generate a link.

Related Resources

Continue with our C++ learning track, try more online compilers, or browse tutorials for step-by-step guides.