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

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

#define MODE(reg,m) ((reg)|=((m&0b111)<<0))
#define Speed(reg,s) ((reg |= ((s&0b11111)<<3)))
//#define Reserved(reg,r)
#define Status(reg,Sta) ((reg |= ((Sta&0b111111)<<10)))
uint16_t pack_register(uint8_t mode, uint8_t speed, uint8_t status) {
    // Your logic here
    uint16_t reg=0;
    MODE(reg,mode);
    Speed(reg,speed);
    //Reserved(reg,0b00);
    Status(reg,status);

    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;
}