Pack Multiple Fields into a 16-bit Control Register

Code

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

typedef struct 
{
    uint8_t mode : 3;
    uint8_t speed : 5;
    uint8_t reserved : 2;
    uint8_t status : 6;
} Register;

uint16_t pack_register(uint8_t mode, uint8_t speed, uint8_t status) {
    Register r;
    r.mode = mode;
    r.speed = speed;
    r.reserved = 0;
    r.status = status;
    return *(uint16_t *)&r;
}

int main() {
    uint8_t mode, speed, status;
    scanf("%hhu %hhu %hhu", &mode, &speed, &status);

    uint16_t reg = pack_register(mode, speed, status);
    printf("%u", reg);
    return 0;
}

Solving Approach