Macro-Based Register Config Helper

Code

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

// Define macros here
#define ENABLE_BIT(ret, value)    ret |= (value << 0)
#define MODE_BIT(ret, value)      ret |= (value << 1)  
#define SPEED_BIT(ret, value)     ret |= (value << 3)  
uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t return_value = 0;
    ENABLE_BIT(return_value, enable);
    MODE_BIT(return_value, mode);
    SPEED_BIT(return_value, speed);
    return return_value;
}

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