A SPACE TO EXPERIMENT

Your ideas. Your code.

Write standard C, run it with GCC, and learn from every result.

C code playground

#include <stdio.h>

int main(void) {
    printf("Hello, C!");
    return 0;
}

$ Your terminal is ready.
Write a program, provide input below, and click Run Code.

Actual stdout, stderr, and compiler diagnostics will appear here.
This is a program-output terminal, not an interactive system shell.

Standard input (stdin)For scanf, fgets, and getchar

Provide all input before running. It is sent to your program’s stdin; the stream closes after this text.

Keyboard: Tab inserts four spaces; Shift+Tab leaves the editor.

C source is sent to Wandbox’s remote GCC sandbox, never executed on your phone. Cloud functions and the external compiler service must be reachable. Don’t submit secret or personal information in your source or input. Sandbox resource limits apply; no phone or local computer needs to stay online.