Extract the Nibble from an 8-bit Register

Code

#include <stdio.h>

unsigned char extractNibble(unsigned char reg, int pos) 
{
    unsigned char res;
    // Write your code here
    if(pos)
    {
        res=reg&0xF0;
        res=res>>4;
        
    }
    else
    {
        res=reg&0x0F;
    }

    return res;
}

int main() {
    unsigned char reg;
    int pos;
    scanf("%hhu %d", &reg, &pos);
    printf("%d", extractNibble(reg, pos));
    return 0;
}

Solving Approach