void setup() {
  // put your setup code here, to run once:
  pinMode(2, INPUT);
  pinMode(3, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
  int x = digitalRead(2);
  if (x==0){
    digitalWrite(3, HIGH);
    digitalWrite(3, LOW);
  }
  else{
    digitalWrite(2, LOW);
  }

}