int LED=11;
int button=13;
int buttonstate=0;

void setup() {
  pinMode(LED, OUTPUT);
  pinMode(button, INPUT);
}
void loop(){
  buttonstate=digitalRead(button);
  if (buttonstate==1){
    digitalWrite(LED,HIGH);
    delay(100);
  }
  else if(buttonstate==0){
    digitalWrite(LED,LOW);
    delay(100);
  }
}