Pack Multiple Fields into a 16-bit Control Register

Code

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

typedef union{
    struct{
        uint16_t mode:3;
        uint16_t speed:5;
        uint16_t resrvd:2;
        uint16_t status:6;
    };
    uint16_t control_reg;
}control_u;

uint16_t pack_register(uint8_t mode, uint8_t speed, uint8_t status) {
    // Your logic here
    control_u control = {
        .mode = mode,
        .speed = speed,
        .resrvd = 0,
        .status = status
    };
    return control.control_reg;
    return 0;
}

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