17. Extract the Nibble from an 8-bit Register

#include <stdio.h>

unsigned char extractNibble(unsigned char reg, int pos) {
    if((pos == 0 || pos == 1)){
        if (pos == 0){
            reg &= 0x0F;
        }
        else {
           reg = (reg & 0xF0) >> 4;
        }
    }
    return reg;
}

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