Macro-Based Register Config Helper

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

// Define macros here
#define Enable(r) r
#define MODE(z) (z=z<<1)
#define SPEED(x) (x=x<<3)

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t result=0;
    Enable(enable);
    MODE(mode);
SPEED(speed);
    result= enable|mode|speed;
    return result;;
}

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;
}