17. Extract the Nibble from an 8-bit Register

#include <stdio.h>
#define NIPPLE_MASK 0x0F
#define BITS_PER_NIPPLE 4
unsigned char extractNibble(unsigned char reg, int pos) {
    // Write your code here
    return (unsigned char)((reg>>(pos * BITS_PER_NIPPLE)) & NIPPLE_MASK);
}

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