70. Packet Layout Using Union with Struct

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

typedef union {
    struct reg {
        uint8_t start;
        uint8_t cmd;
        uint16_t data;
        uint8_t crc;
        uint8_t end;
    };
    uint8_t arrView[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 p;
    printf("%u ",p.arrView[0] = s);
    printf("%u ",p.arrView[1] = c);
    printf("%u ",p.arrView[2] = (d & 0xFF));
    printf("%u ",p.arrView[3] = (d >> 8));
    printf("%u ",p.arrView[4] = crc);
    printf("%u ",p.arrView[5] = e);

}

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;
}