Macro-Based Register Config Helper

Code

#include <stdio.h>
#include <stdint.h>
 int a,b,c;

uint16_t reg=0;
// Define macros here
#define ena(reg,a) (reg|=a);
#define mod(reg,b) (reg|=(b<<1));
#define spee(reg,c) (reg|=(c<<3)); 
uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    ena(reg,enable);
    mod(reg,mode);
    spee(reg,speed);
    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