Macro-Based Register Config Helper

Code

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

// Define macros here
#define Enable(reg,enable) (reg|=(enable<<0))
#define Mode(reg,mode)   (reg|=(mode<<1))
#define Speed(reg,speed)  (reg|=(speed<<3)) 

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t res=0;
    Enable(res,enable);
    Mode(res,mode);
    Speed(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