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)
    return reg = (reg & 0xF0) >> 4; // AB & F0 // 1010 1100 - 1111 0000 - 1010 0000
    else
    return reg = reg & 0x0F;

}

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