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 = (pos == 1)
        ? (reg >> 4) & 0x0f
        : (reg     ) & 0x0f
        ;
    return nibble;
}

int main() {
    unsigned char reg;
    int pos;
    scanf("%hhd %d", &reg, &pos);

    printf("%d", extractNibble(reg, pos));
    return 0;
}