17. Extract the Nibble from an 8-bit Register

#include <stdio.h>

unsigned char extractNibble(unsigned char reg, int pos) 
{
    unsigned char nibble = 0x0;

    if(pos==1)
    {
        nibble = (reg>>4);
    }

    else 
    {  
        nibble = (reg&0x0F);
    }

    return nibble;
}

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