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, uint8_t status) {
    // Your logic here

    uint16_t reg = 0;
    uint16_t mask = mode;

    reg = reg | mode ;
    mask = speed;
    mask = mask << 3;
    reg = reg | mask;
    mask = status;
    mask = mask << 10;
    reg = reg | mask;

    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;
}