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 output = 0;
    if(pos)
    {
        //upper nibble
        output = (reg & 0b11110000) >> 4;
    } else
    {
        //lower nibble
        output = reg & 0b00001111;
    }

    return output;
}

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