Macro-Based Register Config Helper

Code

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

// Define macros here
#define SET_FIELD(reg, field, pos) reg |= (field << pos)
#define SET_ENABLE(reg, enable) SET_FIELD(reg, enable, 0) 
#define SET_MODE(reg, mode) SET_FIELD(reg, mode, 1) 
#define SET_SPEED(reg, speed) SET_FIELD(reg, speed, 3) 

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t result = 0;
    SET_ENABLE(result, enable);
    SET_MODE(result, mode);
    SET_SPEED(result, speed);
    return result;
}

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