Run C++ Online

main.cpp

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

int main() {
    cout << "Hello from C++!" << endl;
    vector<int> v = {1, 2, 3, 4, 5};
    for (int x : v) cout << "  " << x << " squared = " << x*x << endl;
    return 0;
}

Output

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About C++

C++ is a high-performance language used in systems programming, game engines, embedded systems, and performance-critical applications. It offers fine-grained memory control, zero-cost abstractions, and the power of the STL.

Our sandbox runs GCC 14 with full C++23 standard support.

Sandbox Features

Secure execution with Docker + gVisor isolation
GCC 14 with C++23 standard support
Up to 300s execution time (Pro tier)
Stdin support for interactive programs
REST API for programmatic access
No setup or installation required

Use C++ with stateful sessions

Open a session once, then call execute repeatedly — variables, files, and installed packages persist between runs. Perfect for code interpreters and REPL-style agents.

# 1. Create a session
curl -X POST https://api.sandboxapi.dev/v1/sessions \
  -H "X-RapidAPI-Key: $KEY" \
  -d '{"language":"cpp","idle_ttl":300}'
# → {"id":"sess_abc","language":"cpp",...}

# 2. Execute — first call
curl -X POST https://api.sandboxapi.dev/v1/sessions/sess_abc/execute \
  -H "X-RapidAPI-Key: $KEY" \
  -d '{"code":"int x = 42; std::cout << x;"}'

# 3. Execute again — state carries over
curl -X POST https://api.sandboxapi.dev/v1/sessions/sess_abc/execute \
  -H "X-RapidAPI-Key: $KEY" \
  -d '{"code":"// Note: C++ is compiled — sessions persist files, not REPL state"}'

Note: C++ is a compiled language. Sessions persist installed packages and files on disk, but variable state does not carry between calls. Use multi-file submissions or write intermediate state to disk.

Read the sessions docs →

About C++

Sandbox Features

Use C++ with stateful sessions

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