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 = 0;

    reg |= ((uint16_t)(mode   & 0x07u)) << 0;   // 3 bits: 0-2
    reg |= ((uint16_t)(speed  & 0x1Fu)) << 3;   // 5 bits: 3-7
    reg |= ((uint16_t)(status & 0x3Fu)) << 10;  // 6 bits: 10-15

    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;
}