const int pinButton = 2;
const int pinLED = 8;

void setup() {
  pinMode(pinButton, INPUT);
  pinMode(pinLED, OUTPUT);

  digitalWrite(pinLED, HIGH);
}

void loop() {
  if(digitalRead(pinButton) == LOW) {
    digitalWrite(pinLED, HIGH);
  } else {
    digitalWrite(pinLED, LOW);
  }
}