70. Packet Layout Using Union with Struct

#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) {
    Packet frame;
    frame.raw[0] = s;
    frame.raw[1] = c;
    frame.raw[2] = (uint8_t)d ;
    frame.raw[3] = d >> 8;
    frame.raw[4] = crc ;
    frame.raw[5] = e ;

    for(int i = 0; i < 6; i++)
    {
        printf("%d ", frame.raw[i]);
    }
    printf("\n");
}

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;
}