Macro-Based Register Config Helper

Code

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

// Define macros here
#define ENABLE(reg,enable) (reg|= (enable<<0))
#define MODE(reg,mode) (reg|= (mode<<1))
#define SPEED(reg,speed) (reg|= (speed<<3))

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t reg_final=0;
    ENABLE(reg_final,enable);
    MODE(reg_final,mode);
    SPEED(reg_final,speed);

    return reg_final;
}

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