Macro-Based Register Config Helper

Code

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

// Define macros here
#define ENABLE(en) ((en & 0b1) << 0)
#define MODE(mo) ((mo & 0b11) << 1)
#define SPEED(sp) ((sp & 0b111) << 3)

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t res = 0;
    // // enable &= 0b1; 
    res ^= ENABLE(enable);
    // // mode &= 0b11; 
    res ^= MODE(mode);
    // // speed &= 0b111; 
    res ^= SPEED(speed);
    // return ENABLE(enable)|MODE(mode)|SPEED(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