Packet Layout Using Union with Struct

Code

#include <stdint.h>
#include <stdio.h>

typedef union {
  struct {
    uint8_t start;
    uint8_t command;
    uint16_t data;
    uint8_t crc;
    uint8_t end;
  } fields;
  uint8_t raw[6];
} Packet;

// Fill struct fields and print raw bytes
void build_and_print_packet(uint8_t s, uint8_t c, uint16_t d, uint8_t crc,
                            uint8_t e) {
  // Your logic here
  Packet packet;
  packet.fields.start = s;
  packet.fields.command = c;
  packet.fields.data = d;
  packet.fields.crc = crc;
  packet.fields.end = e;

  for (int i = 0; i < 6; i++) {
    printf("%u ", packet.raw[i]);
  }
}

int main() {
  uint8_t s, c, crc, e;
  uint16_t d;
  scanf("%hhu %hhu %hu %hhu %hhu", &s, &c, &d, &crc, &e);
  build_and_print_packet(s, c, d, crc, e);
  return 0;
}

Solving Approach