Macro-Based Register Config Helper

Code

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

// Define macros here
#define SET_ENABLE(a, x, b) ((a) |= (((x) & 0x01) << (b)));
#define SET_MODE(a, x, b) ((a) |= (((x) & 0x03) << (b)));
#define SET_SPEED(a, x, b) ((a) |= (((x) & 0x07) << (b)));
uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t res = 0;
    SET_ENABLE(res, enable, 0);
    SET_MODE(res, mode, 1)
    SET_SPEED(res, speed, 3);
    return res;
}

int main() {
    uint8_t enable, mode, speed;
    scanf("%hhu %hhu %hhu", &enable, &mode, &speed);

    uint16_t reg = build_register(enable, mode, speed);
    printf("%u", reg);
    return 0;
}

Solving Approach