Macro-Based Register Config Helper

Code

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

// Define macros here

#define ENABLE(x)   (((x) & 1) << 0)
#define MODE(x)     (((x) & 3) << 1)
#define SPEED(x)    (((x) & 7) << 3)

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed)
{
    return ENABLE(enable)|MODE(mode)|SPEED(speed);
}

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