int ledPin = 12; 
int buttonPin = 4;
int buttonState = false;

void setup()
{
  Serial.begin(9600);
  Serial.println("Hello Whirled!\n");

  pinMode(ledPin, OUTPUT);
  pinMode (buttonPin, INPUT);
 }

void loop()
{
  if (digitalRead(buttonPin) == false) {
    Serial.println("tokkling the LED because");
    buttonState = !buttonState;
    digitalWrite(ledPin, buttonState);
  }

// see this not work. change to (!digitalRead(buttonPin) to fix it
  while (digitalRead(buttonPin)) {
    Serial.println("hanging on that input");
    delay(200);
  }
  
  Serial.println(" a brief delay");

  delay(500);
}