C Playground
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Run C code online, free
Write, compile and run C programs from your browser with GCC 13.2. There is nothing to install and no account: type your code and press Run, or Ctrl+Enter.
When you press Run, your code is sent to Wandbox, a free online compiler service, which compiles and runs it and sends back the output. Unlike Python, which runs on your device, C code leaves your browser, so do not include passwords or other secrets.
Giving your program input
- Use the stdin box
- Programs that read with
scanforfgetsget their input from the stdin box above the editor. Type everything your program will read, separated by spaces, before you press Run. - See compiler messages
- Compiler errors and warnings appear in the terminal with their line numbers, so you can fix them and run again.
How to run C code online
- Write or paste your C program, including a main function.
- If it reads input, type the values into the stdin box.
- Press Run and read the output in the terminal.
Frequently asked questions
Which C compiler is used?
GCC 13.2, compiling C, through the Wandbox online compiler service.
Is my C code private?
Your code is sent to Wandbox to be compiled and run. Do not include passwords, keys or other secrets in it.
Can I compile several files?
No. Only the file that is open in the editor is compiled and run.
Where can I find C examples?
The C examples cover basics, control flow, functions, arrays, strings and pointers.