const int button = 2;
const int led = 13;
void setup() {
  pinMode(led, OUTPUT);
  pinMode(button, INPUT_PULLUP);
}

void loop() {
  int newValue = digitalRead(button);
  
 if (newValue == LOW) {        
    digitalWrite(led, HIGH);   
  } else {                    
    digitalWrite(led, LOW);     
  }
}