25. Pack Multiple Fields into a 16-bit Control Register

#include <stdio.h>
#include <stdint.h>

// #define MODE(reg, mode)  (reg |= ((mode&0xFFFF) << 0))
// #define SPEED(reg, speed) (reg |= ((speed&0xFFFF) << 3))
// #define STATUS(reg, status) (reg |= ((status&0xFFFF) << 10))

uint16_t pack_register(uint8_t mode, uint8_t speed, uint8_t status) {
    // Your logic here
    uint16_t reg = 0;
    reg |= mode<<0|speed<<3|status<<10;    // do or(|) operation with all parameters

    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;
}