int buttonPin = 2;
int ledPin = 13;
int buttonState = 0;
void setup()  {
pinMode(ledPin, OUTPUT);
pinMode(buttonPin, INPUT);
}
void loop() {
 buttonState = digitalRead(buttonPin);
  if(buttonState == HIGH)  {
    digitalWrite(ledPin, HIGH);
  }
  else{
    digitalWrite(ledPin, LOW);
  }
}