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 mask = 0;
    mask |= ((((1U << 3) - 1U) & mode) << 0);    //mode
    mask |= ((((1U << 5) - 1U) & speed) << 3);   //speed
    mask |= ((((1U << 6) - 1U)& status) << 10) ; //status
    mask |= ((!((1U << 2) - 1U)) << 8);          //reserved
    return mask;
}

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;
}