17. Extract the Nibble from an 8-bit Register

#include <stdio.h>

unsigned char extractNibble(unsigned char reg, int pos) {
    // Write your code here
    unsigned char nibble = 0;
    unsigned char mask = 0xF;
    if(pos == 0){
        nibble = ((reg >> 0) & mask);
    }
    else if(pos == 1) {
        nibble = ((reg >> 4) & mask);
    }
    return nibble;
}

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