#define LEDPIN 13
#define BUTTONPIN 12

void setup(){
  pinMode(LEDPIN, OUTPUT);
  pinMode(BUTTONPIN, INPUT);
}

void loop(){
  int Buttonstate = digitalRead(BUTTONPIN);

  if(Buttonstate){
    digitalWrite(LEDPIN, HIGH);
  }
  else{
    digitalWrite(LEDPIN, LOW);
  }
  delay(100);
}