int button = 4;
int buttonState;

int led = 9;

void setup() {
  // put your setup code here, to run once:
  pinMode(button, INPUT);
  pinMode(led, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  buttonState = digitalRead(4);
  if(buttonState == HIGH)
  {
    //Serial.println("Pressed");
    digitalWrite(led,HIGH);
  }
  else
  digitalWrite(led,LOW);
}