Macro-Based Register Config Helper

Code

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

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

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t temp = 0;
    ENABLE(temp,enable);
    MODE(temp,mode);
    SPEED(temp,speed);
    return temp;
}

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