int ledPin = 13;    //Assigns the variable to pin 13
int buttonPin = 2;      //Assigns the variable to pin 2
int buttonState = 0;       //off

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin, INPUT);
}

void loop() {
  buttonState = digitalRead(buttonPin);

  if (buttonState == HIGH) { //The button when pressed
    digitalWrite(ledPin, LOW);
  } else {
    digitalWrite(ledPin, HIGH);
  }
}