Pack Multiple Fields into a 16-bit Control Register

Code

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

uint16_t pack_register(uint8_t mode, uint8_t speed, uint8_t status) {
    // Your logic here
    uint16_t result = 0 ;
    // mode 
    result |= (mode & 7 );
    int speed_mask = (1u << 5) -1;
    result |= (speed & speed_mask ) << 3;

    int status_mask = (1u << 6) -1;
    result |= (status & status_mask ) << 10;

    return result;
}

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