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 = 0x0000;
    // printf("reg (1): %b\n", reg);
    reg |= mode;
    // printf("reg (2): %b\n", reg);
    uint16_t buffer = 0x0000 + speed;
    buffer = buffer << 3;
    reg |= buffer;
    // printf("reg (3): %b\n", reg);
    buffer = (0x0000 + status) << 10;
    reg |= buffer;
    // printf("reg (4): %b\n", reg);
    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;
}