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
    mode = (mode > 7) ? 7 : mode;
    speed = (speed > 31) ? 31 : speed;
    status = (status > 63) ? 63 : status;
    uint16_t res = 0 | (mode) | (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;
}