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 result = 0;

    if(mode>7) mode = 7;
    if(speed > 31) speed = 31;
    if(status > 63) status = 63;

    result |= (mode & 7);
    result |= (speed & 31) << 3;
    result |= (status & 63) << 10;
    return result;
}

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;
}