Online C Editor

The tool provides an in-browser environment to write, compile, and execute C programs. It supports multiple C standards (C89/C90, C99, C11) and runs code in a sandbox with limits on time and memory to ensure safety. Users supply source code, select a standard, and optionally provide input data; the system compiles the code and, if successful, executes it, returning stdout, stderr, exit code, and timing information. Conceptually, the process mirrors a typical local toolchain but is centralized and isolated to prevent side effects. This enables learners to experiment with algorithms, data structures, and system calls without installing compilers or configuring toolchains.

The tool benefits students, instructors, and developers who need quick feedback on small code snippets, algorithm demonstrations, or debugging sessions. Unique value lies in combining a real compiler backend with sandboxed execution and precise diagnostic streaming, including line-numbered compiler errors and runtime diagnostics. Core features include source editing, standard selection, optional input handling, a sandboxed execution environment, and a clear separation of outputs (stdout, stderr) for easy interpretation. Typical use cases include coursework verification, algorithm prototyping, and learning C language features such as pointers, memory management, and I/O behavior.

The tool emphasizes reliability, reproducibility, and safety. It handles edge cases like syntax errors, invalid memory access, or missing main by surfacing meaningful messages and a sanitized exit code. It does not expose external libraries beyond the standard C library, and it does not perform networked file operations. This makes it suitable for classroom and personal learning contexts where deterministic results and safe execution are paramount.