CForge is a free online C and C++ compiler built for students and developers who just want to run C code fast. ✦ No installation or signup required ✦ GCC 10.2 — supports C99, C11, C17, C++17 ✦ Standard input (scanf) support ✦ Command line arguments (argc/argv) ✦ Shareable links with code embedded in URL ✦ Auto-saves your session ✦ Syntax highlighting with line numbers Just write code and hit Run.