DeetCode.

Endian Swap 32-bit Word

Easy C Data Flow Asked at NVIDIA
Solve this problem

Write a C function that converts a 32-bit word between big-endian and little-endian byte order. Needed whenever a network packet or a foreign-endian peripheral hands you a raw word.

Constraints

  • Signature: `uint32_t swap32(uint32_t value)`.
  • Pure arithmetic - no pointer casting or type punning.
  • Must not depend on the host's native endianness.
  • Single expression preferred.
  • No library calls.
Starter codeC
1#include <stdint.h>2 3uint32_t swap32(uint32_t value) {4    // TODO: reverse byte order5    return 0;6}