25. Pack Multiple Fields into a 16-bit Control Register

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

uint16_t pack_register(uint8_t mode, uint8_t speed, uint16_t status) {
    // Your logic here
    uint16_t res = 0xFF;
    res = mode & res; 
    res |= ((speed<<3) | mode);
    status = ((status<<10) | res);
    return status;
}

int main() {
    uint8_t mode, speed;
    uint16_t status;
    scanf("%hhu %hhu %hhu", &mode, &speed, &status);

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