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

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

uint16_t pack_register(uint8_t mode, uint8_t speed, uint8_t status) 
{
    uint16_t ans=0x0000;  //16 bit representation of 0.
    ans=ans|mode;         //Logic to set Mode.
    ans=ans|(speed<<3);   //Logic to set Speed.
    ans=ans|(status<<10); //Logic to set Status.
    return ans;
}

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;
}