Práctica Arduino LDR+LED

void setup ()

pinMode (2,OUTPUT);//led verde
pinMode (3,OUTPUT);//led amarillo
pinMode (A0,OUTPUT)://fotocelda

{
  int fotocelda=analogRead(A0);
  if(fotocelda<100)
  }

   digitalWrite (2, HIGH);//encender led
   digitalWrite (3, HIGH);//encende led

  }
  else
  {

    digitalWrite(2, LOW);//apagar led
    digitalWrite(3, LOW);//apagar led