Macro-Based Register Config Helper

Code

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

// Define macros here
#define ENABLE(r, b) ((r) |= (b << 0))
#define MODE(r, v) ((r) |= (v << 1))
#define SPEED(r, v) ((r) |= (v << 3))


uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    uint16_t re= 0;
    ENABLE(re, enable);
    MODE(re, mode);
    SPEED(re, speed);
    return re;
}

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