While handles high-level streams (like printf ), works with low-level .
: The rawest way to move data between your program and a file or socket.
#ifdef _WIN32 #include #else #include #endif Use code with caution. Copied to clipboard
: Replaces the current process image with a new one (how your terminal launches other apps). getpid() : Tells the program its own unique process ID. ⏱️ System & Time