Run C++ Programs Online — No G++ Installation Needed
College computer labs often suffer from restrictive administrator permissions, outdated MinGW installations, or frozen hard drives with Deep Freeze that wipe out local compiler configurations every time the machine reboots. MyCollegeLab eliminates this friction with a cloud-hosted, web-based C++ development environment running G++ 12.2 on Ubuntu Linux, requiring zero local setup or toolchain downloads.
Whether you are an engineering student working through first-year B.Tech Object-Oriented Programming (OOP) practicals, implementing Data Structures and Algorithms with the Standard Template Library (STL), or testing competitive coding solutions, you can write, compile, and execute C++ programs directly inside your browser on locked lab PCs, library laptops, or mobile devices.
What Our Online C++ Compiler Supports
Pre-configured with modern C++17 (-std=c++17 -O2) by default, providing structured bindings, standard string views, and optimized binary execution.
Complete support for classes, constructors, destructors, single/multiple inheritance, runtime polymorphism with virtual methods, and template metaprogramming.
Supply multiple inputs to cin or getline via the dedicated stdin tab prior to execution, supporting complex test scenarios.
Vectors, maps, sets, unordered containers, priority queues, and sorting algorithms work out of the box with zero external configuration.
C++ Programs to Run Right Now
Program 1 — Hello OOP (Classes & Objects)
#include <iostream>
using namespace std;
class Student {
public:
string name;
int roll;
void display() {
cout << "Name: " << name << ", Roll: " << roll << endl;
}
};
int main() {
Student s;
s.name = "Rahul";
s.roll = 101;
s.display();
return 0;
}Program 2 — STL Vector + Sort
#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main() {
vector<int> v = {64, 34, 25, 12, 22, 11, 90};
sort(v.begin(), v.end());
cout << "Sorted: ";
for (int x : v) cout << x << " ";
cout << endl;
return 0;
}Program 3 — Fibonacci with cin
#include <iostream>
using namespace std;
int main() {
int n;
cin >> n;
long long a = 0, b = 1;
cout << "Fibonacci: ";
for (int i = 0; i < n; i++) {
cout << a << " ";
long long c = a + b;
a = b; b = c;
}
cout << endl;
return 0;
}▶ For Program 3, enter a number in the stdin tab before running.
Standard Template Library (STL) Support
Frequently Asked Questions
What C++ version does your compiler use?
MyCollegeLab uses G++ 12.2 on an isolated Ubuntu Linux sandbox. By default, code is compiled with C++17 (-std=c++17 -O2), ensuring complete compatibility with modern C++ standards, structured bindings, and current university curriculums.
Does the online C++ compiler support multiple files?
Single-file compilation is supported for now. You can define multiple classes, structs, templates, and namespaces within the single editor tab, which covers 100% of engineering college lab assignments and competitive coding problems.
Can I practice OOP (Object-Oriented Programming) practicals?
Yes, all OOP concepts work seamlessly — including classes, objects, constructors, destructors, single and multiple inheritance, virtual functions, abstract classes, operator overloading, and templates.
Does it support cin and multiple inputs?
Yes, use the dedicated stdin tab located next to the output console. You can provide space-separated or line-separated inputs before clicking "Run", and your C++ program will read them sequentially using cin or getline.