int LED=13;
int BUTTONPIN=8;
int BUTTONSTATE=0;
void setup() {
  pinMode(13, OUTPUT);
  pinMode(8, INPUT_PULLUP);
}

void loop() {
  BUTTONSTATE = digitalRead(BUTTONPIN);
  if(BUTTONSTATE==HIGH)
  digitalWrite(LED, HIGH);
  else
  digitalWrite(LED, LOW);
 
}