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

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

#define MODE 0
#define SPEED 3
#define STATUS 10
uint16_t pack_register(uint8_t mode, uint8_t speed, uint8_t status) {
   uint16_t reg = 0;
   reg |= ((mode & 0x07)<<MODE);
   reg |= ((speed & 0x1F)<< SPEED);
   reg |= ((status & 0x3F)<<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;
}