Macro-Based Register Config Helper

Code

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

// Define macros here
#define _mode(r,m) (r|=(m<<1))
#define _enable(r,e) (r|=e)
#define _speed(r,s) (r|=(s<<3))

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint8_t reg = 0;
    _enable(reg,enable);
    _mode(reg,mode);
    _speed(reg,speed);
    return reg;
}

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