17. Extract the Nibble from an 8-bit Register

#include <stdio.h>

#define LOWMASK 0x0F
#define HIGHMASK 0xF0

unsigned char extractNibble(unsigned char reg, int pos) {
    // Write your code here
    unsigned char res = pos?((reg&HIGHMASK)>>4):reg&LOWMASK;
    return res;
}

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