// Blink program W1HRM
 // also demonstrate 2's compliment
 
void setup()
{
  DDRB = B11111111; // set PORTB (digital 8-13) to outputs
  Serial.begin(9600);
}
 
void loop()
{
  PORTB = B00100000; // digital 8-13 HIGH, digital 13 HIGH
  delay(1000);
  PORTB = B11011111; // digital 8-13LOW, digital 13 LOW
  delay(1000);
  int x = ~ B11011111;  // 2's compliment "~" 00100000
  delay(1000);
  Serial.println(x,BIN);
 // while(true);
}