⚙️ C++ Playground

Write C++ code below and click Run. Everything runs in your browser — nothing is sent to our servers. No signup, no install, no nonsense.

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⚙️

C++ can't run inline (yet)

Some languages need a real compiler or runtime that doesn't fit in a browser. But you can run C++ instantly on these free platforms:

Open in Replit ↗ Open in OneCompiler ↗

Sample C++ code:

C++ example

// Fast vector operations
std::vector<int> nums = {1, 2, 3, 4, 5};

int sum = std::accumulate(
    nums.begin(), nums.end(), 0
);

std::cout << "Total: " << sum;

Try these C++ examples

Click any example to load it into the editor:

A note on this playground

Code runs in your browser using open-source engines (Pyodide for Python, native JS for JavaScript, AlaSQL for SQL). Nothing is sent to OneCity's servers. No accounts, no tracking. If you save your work, copy-paste it somewhere else — refreshing the page resets the editor.