17. Extract the Nibble from an 8-bit Register

#include <stdio.h>

unsigned char extractNibble(unsigned char reg, int pos) 
{
    if(pos == 0)
    {
        reg = reg & 0x0F;
    }
    else if(pos ==1)
    {
        reg = (reg >> 4) & 0x0F;
    }
    return reg;
}

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