Macro-Based Register Config Helper

Code

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

// Define macros here
#define SET_ENB(a,b) ((a)|=(b))
#define SET_MODE(a,b) ((a)|=(b<<1))
#define SET_SPD(a,b) ((a))|=(b<<3)
uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t res =0;
    SET_ENB(res,enable);
    SET_MODE(res,mode);
    SET_SPD(res,speed);
    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