Macro-Based Register Config Helper

Code

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

// Define macros here
#define SET_ENABLE(x)   (x & 1) << 0
#define SET_MODE(x)     (x & 0x3) << 1
#define SET_SPEED(x)    (x & 0x7) << 3

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t res = 0;
    res |= SET_ENABLE(enable);
    res |= SET_MODE(mode);
    res |= SET_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