Macro-Based Register Config Helper

Code

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

// Define macros here
#define set_enable(ma_reg, val) (ma_reg) |= (val << 0)
#define set_mode(ma_reg, val) (ma_reg) |= (val << 1)
#define set_speed(ma_reg, val) (ma_reg) |= (val << 3)

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t val = 0;
    set_enable(val, enable);
    set_mode(val, mode);
    set_speed(val, speed);
    return val;
}

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