12 bit binary counter

// by M. De Riso
// 2^12 binary counter

void setup()
{
  Serial.begin(9600);
}

void loop()
{
  digitalWrite(13, HIGH);
  delay(100); // Wait for x millisecond(s)
  digitalWrite(13, LOW);
  delay(100); // Wait for x millisecond(s)

  int bit;
  for(int num=0;num<=4095;num++)
  {
    String nums="";
    int n=num;
    for(int i=11;i>=0;i--) {
        bit=n % 2;
        n=n/2;
        nums = (String) bit + nums;
    }
  Serial.println(nums + "  ");
  }

}