byte valueA = 0b1010;  // binary 10
byte valueB = 0b0110;  // binary 6
byte result;

void setup() {
  Serial.begin(9600);
  for (int i = 8; i <= 11; i++) pinMode(i, OUTPUT);
}

void loop() {
  result = valueA & valueB;  // bitwise AND
  showBits(result);
  delay(1000);

  result = valueA | valueB;  // bitwise OR
  showBits(result);
  delay(1000);

  result = valueA ^ valueB;  // bitwise XOR
  showBits(result);
  delay(1000);

  result = ~valueA;          // bitwise NOT
  showBits(result);
  delay(2000);
}

void showBits(byte val) {
  for (int i = 0; i < 4; i++) {
    digitalWrite(8 + i, bitRead(val, i));
  }
  Serial.print("Result: ");
  Serial.println(val, BIN);
}