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_buff = 0;
    uint16_t speed_buff = speed;
    uint16_t status_buff = status;

    reg_buff |= mode & ((0x1 << 3) - 1);
    reg_buff |= (speed_buff & ((0x01 << 5) - 1)) << 3;
    reg_buff |= (status_buff & ((0x01 << 6) - 1)) << 10;
    return reg_buff;
}

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;
}