Macro-Based Register Config Helper

Code

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

// Define macros here
#define setenable(reg, n) (n? reg |= ( 1<< 0) : reg &= ~(1 << 0))
#define setmode(reg, m) (reg |= (m << 1))
#define setspeed(reg, s) (reg |= (s << 3))
#define reserved(reg) (reg &= ~((1 << 6) | (1 << 7)))

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t reg = 0;
    setenable(reg, enable);
    setmode(reg, mode);
    setspeed(reg,speed);
    reserved(reg);
    
    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