Macro-Based Register Config Helper

Code

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

// Define macros here
#define Enable(e) ((e & 0x01) << 0)
#define Mode(m)   ((m & 0x03) << 1)
#define Speed(s)  ((s & 0x07) << 3)

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