Pack Multiple Fields into a 16-bit Control Register

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

#define MODE_MASK 0x07
#define MODE_POS 0

#define SPEED_MASK 0x1F
#define SPEED_POS 3

#define RESERVED_MASK 0x03
#define RESERVED_POS 8

#define STATUS_MASK 0x3F
#define STATUS_POS  10

uint16_t pack_register(uint8_t mode, uint8_t speed, uint8_t status) {
    // Your logic here
    uint16_t reg = 0;
    //1. set mode
    reg |= (mode & MODE_MASK) << MODE_POS;

    reg |= (speed & SPEED_MASK) << SPEED_POS;

    reg |= (status & STATUS_MASK) << STATUS_POS;


    return reg;
}

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;
}