Macro-Based Register Config Helper

Code

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

// Define macros here
#define ENABLE(e,r) (r | e)
#define MODE(m,r) (r | (m<<1))
#define SPEED(s,r) (r | (s<<3))

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    uint16_t reg=0;
    reg=ENABLE(enable,reg);
    reg=MODE(mode,reg);
    reg=SPEED(speed,reg);
    // Use macros to set fields
    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