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

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

#define SET_VAL(r, v, p, l) (r |= ((v & l) << p))

uint16_t pack_register(uint8_t mode, uint8_t speed, uint8_t status) {
    // Your logic here
    uint16_t reg = 0;
    SET_VAL(reg, mode, 0, 0b111);
    SET_VAL(reg, speed, 3, 0b11111);
    SET_VAL(reg, status, 10, 0b111111);
    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;
}