Macro-Based Register Config Helper

Code

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

// Define macros here
#define SET_ENABLE(v) ((v&0x01)<<0)
#define SET_MODE(v) ((v&0x03)<<1)
#define SET_SPEED(v) ((v&0x07)<<3)

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t result;

    result|=SET_ENABLE(enable);
    result|=SET_MODE(mode);
    result|=SET_SPEED(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