©️ 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

#include <stdio.h>

int main() {
    int arr[] = {10, 20, 30, 40};
    int sum = 0;
    
    for (int i = 0; i < 4; i++) {
        sum += arr[i];
    }
    printf("Sum: %d", sum);
}

Try these C examples

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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.