Pack Multiple Fields into a 16-bit Control Register

Code

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

#define MODE  (mode<<0)&((1<<3)-1)
#define SPEED  (speed<<3)&((1<<8)-1)
//#define RESERVED (1<<8)& 0
#define STATUS  (status<<10)&((1<<16)-1)

uint16_t pack_register(uint8_t mode, uint8_t speed, uint8_t status) {
    // Your logic here
    uint16_t res= MODE|SPEED| STATUS;
    return res;
}

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;
}

Solving Approach