void setup() {
  // put your setup code here, to run once:
  pinMode ( 2, INPUT );
  pinMode ( LED_BUILTIN, OUTPUT );
}

void loop() {
  // put your main code here, to run repeatedly:
  int buttonPressed = digitalRead(2);
  if ( buttonPressed == HIGH ) {
    digitalWrite ( LED_BUILTIN, HIGH );
  } else {
    digitalWrite ( LED_BUILTIN, LOW );
  }
}