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

#include <stdio.h>
#include <stdint.h>
#define SET_MODE(a,b) ((a)|=(b))
#define SET_SPD(a,b) ((a)|=(b<<3))
#define SET_STA(a,b) ((a)|=(b<<10))
uint16_t pack_register(uint8_t mode, uint8_t speed, uint8_t status) {
    // Your logic here
    if(mode > 7) mode=7;
    if(speed > 31) speed = 31;
    if(status > 63) status = 63;
    uint16_t res = 0;
    SET_MODE(res,mode);
    SET_SPD(res,speed);
    SET_STA(res,status);
    return res;
    
}

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;
}