Processor Endianness: Detect and Convert Between Little-Endian and Big-Endian Byte Orders

Problem Write a function in C that detects at runtime whether the current processor is little-endian or big-endian, and implement functions to swap the byte order of 16-bit, 32-bit, and 64-bit integers. Example: Follow-ups Describe the union-based trick for detecting endianness at runtime without undefined behavior. Why does network protocol code (sockets) always use htonl/ntohl, and what standard defines this? How do modern compilers (GCC, Clang) optimize bswap32 -- what intrinsic or instructio…