Macro-Based Register Config Helper

Code

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

// Define macros here
#define ENABLE(val,x) val|=x;
#define MODE(val,x) val=val|((0x3&x)<<1);
#define SPEED(val,x) val=val|((0x07&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(result,enable);
    MODE(result,mode);
    SPEED(result,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;
}

Solving Approach