public boolean old35(int n) {
  if (n % 3 == 0 && n % 5 != 0) {
    return true;
  }
  else if (n % 3 != 0 && n % 5 == 0) {
    return true;
  }
  else {
    return false;
  }
}

public boolean old35(int n) {
  boolean mult3 = n % 3 == 0;
  boolean mult5 = n % 5 == 0;
  if (mult3 && !mult5) {
    return true;
  }
  else if (!mult3 && mult5) {
    return true;
  }
  else {
    return false;
  }
}

public boolean old35(int n) {
  boolean mult3 = n % 3 == 0;
  boolean mult5 = n % 5 == 0;
  return (mult3 && !mult5) || (!mult3 && mult5);
}

// Exclusive OR !!
public boolean old35(int n) {
  boolean mult3 = n % 3 == 0;
  boolean mult5 = n % 5 == 0;
  return mult3 ^ mult5;
}