Pack Multiple Fields into a 16-bit Control Register

Code

#include <stdio.h>
#include <stdint.h>
#define set_mode(Mode) (((Mode) & 0x07) << 0)
#define set_speed(Speed) (((Speed) & 0x1F) << 3)
#define set_status(Status) (((Status) & 0x3F) << 10)


uint16_t pack_register(uint8_t mode, uint8_t speed, uint8_t status) {
    uint16_t result = 0;
    return (result | set_mode(mode) | set_speed(speed) | set_status(status));
}

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;
}

Solving Approach