Packet Layout Using Union with Struct

Code

#include <stdio.h>
#include <stdint.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 pac;
    // pac.raw[0] = s;
    // pac.raw[1] = c;
    // pac.raw[2] = (d & 0xFF);
    // pac.raw[3] = (d >> 8);
    // pac.raw[4] = crc;
    // pac.raw[5] = e;

    pac.fields.start = s;
    pac.fields.command = c;
    pac.fields.data = d;
    pac.fields.crc = crc;
    pac.fields.end = e;


    for(int i=0;i<6;i++){
        printf("%u ",pac.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