Macro-Based Register Config Helper

Code

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

// Define macros here
#define en(x,en) (x = x|en)
#define md(x,mode) (x = x|(mode<<1))
#define spd(x,spd) (x = x|(spd<<3))

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t tmp = 0;
    en(tmp,enable);
    md(tmp,mode);
    spd(tmp,speed);
    return tmp;
}

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