int switchState = 0;
void setup() {
  pinMode(3,OUTPUT);
  pinMode(4,OUTPUT);
  pinMode(5,OUTPUT);
  pinMode(2,INPUT);
    } 
void loop() {
  switchState = digitalRead(2);
  // this is a comment
  if (switchState == LOW){
    // the button is not pressed
    digitalWrite(3,LOW);//green LED
    digitalWrite(4,LOW);//red LED
    digitalWrite(5,HIGH);//red LED
  }
  else { //the button is pressed
  digitalWrite(3,LOW);
  digitalWrite(4,LOW);
  digitalWrite(5,HIGH);
  delay(250);  // wait for a quarter second
  // toggle the LEDs
  digitalWrite(4,HIGH);
  digitalWrite(5,LOW);
  delay(250); //wait for a quarter second
  }
} // go back to the beginning of the loop