const int BUTTON = 2;
const int LED = 3;
int BUTTONstate = 0;
  
void setup() {
  // put your setup code here, to run once:
  pinMode(BUTTON, INPUT);
  pinMode(LED, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  BUTTONstate = digitalRead(BUTTON);
  if(BUTTONstate == HIGH){
    digitalWrite(LED, HIGH);
  }
  else{
    digitalWrite(LED, LOW);
  }
}