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 reg = 0;
    uint16_t mode_out = 0;
    uint16_t speed_out = 0;
    uint16_t status_out = 0;
    
    //mode
    mode_out = reg | mode;

    //speed
    speed_out = (reg | speed) << 3;

    //status
    status_out = (reg | status) << 10;

    reg = (mode_out | speed_out);
    reg = (reg | status_out);

    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;
}

Solving Approach