void setup() {
  // init serial interface
  // make sure to set up the serial monitor with the same baud rate
  Serial.begin(115200);
  // wait 500 ms before program execution 
  // to account for serial interface initialization
  delay(500);
  // print empty line so the console output looks prettier
  Serial.println("");
  // number of rows in our truth table
  const int N = 8;
  // init inputs
  bool a[N] = {0, 0, 0, 0, 1, 1, 1, 1};
  bool b[N] = {0, 0, 1, 1, 0, 0, 1, 1};
  bool c[N] = {0, 1, 0, 1, 0, 1, 0, 1};
  // allocate memory to store output values
  bool d[N];
  // compute truth table
  for (int i=0; i<N; i++) {
    // here, we use an xor relation to simulate an xor gate
    // but we can also use "and", "or" or "not"
    d[i] = (not a[i] or b[i] or c[i]) and not((a[i] and b[i]) or (not b[i] and not c[i]));
  }
  // print truth table to serial interface
  Serial.println("----------");
  Serial.println("|a|b|c||d|");
  Serial.println("----------");
  for (int i=0; i<N; i++) {
    // we use the '+' operator to concatenate strings
    String line = "|" + String(a[i]) + "|" + String(b[i]) + "|" + String(c[i]) + "|" + String(d[i]) + "||";
    Serial.println(line);
  }
  Serial.println("----------");
}

void loop() {
  // nothing to do anymore... (not a[i] or b[i] or c[i]) and (a[i] or b[i] or 
}