Pack Multiple Fields into a 16-bit Control Register

Code

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

uint16_t pack_register(uint8_t mode, uint8_t speed, uint8_t status) {
    // Your logic here
    uint16_t res = 0 , i;

    /*res = res | mode;
    res = (res << 3);
    res = res | speed;
    res = (res << 5);
    //res = res | 0;
    res = (res << 2);
    res = res | status;
    res = res << 6;
    //res = res >> 16;*/

    res |= (mode<<0)|(speed<<3)|(status<<10);
    return res;
}

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