Macro-Based Register Config Helper

Code

#include <stdio.h>
#include <stdint.h>
#define SETBIT(VARIABLE,POSITION) VARIABLE |= (1 << POSITION)
#define CLEARBIT(VARIABLE,POSITION) VARIABLE &= ~(1 << POSITION)
#define TOGGLEBIT(VARIABLE,POSITION) VARIABLE ^= (1 << POSITION)

// Define macros here

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) 
{
    // Use macros to set fields
    uint16_t result = 0x00;
    uint8_t Enable_mask = 0x01;
    uint8_t Mode_mask = 0x03;
    uint8_t Speed_mask = 0x07;
    uint8_t result1 = 0x00;    
    if((Enable_mask & enable) != 0)
    {
        SETBIT(result,0); 
    }
    if((Mode_mask & mode) != 0)
    {
        result1 = Mode_mask & mode;
        result |= (result1 << 1);
    }
    if((Speed_mask & speed) != 0)
    {
        result1 = Speed_mask & speed;
        result |= (result1 << 3);
    }

    //printf("%d ",result);
    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