17. Extract the Nibble from an 8-bit Register

#include <stdio.h>

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

}

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