Macro-Based Register Config Helper

Code

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

 
#define ENABLE (reg | enable)
#define MODE (((reg >> 1) | mode) << 1 )
#define SPEED (((reg >> 3) | speed) << 3 )

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    uint16_t reg = 0;

    uint16_t reg1 = ENABLE;
    uint16_t reg2 = MODE;
    uint16_t reg3 = SPEED;
    reg = reg1 | reg2 | reg3;
    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