17. Extract the Nibble from an 8-bit Register

#include <stdio.h>

unsigned char extractNibble(unsigned char reg, int pos) {
    // Write your code here
    if (pos == 0) {
        reg = (0x0F & reg)>>0;
    } else if (pos == 1) {
        reg = (0xF0 & reg)>>4;
    } else {
        // n/a
    }
    return reg;
}

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