// if - else sample code

void setup() {
  // put your setup code here, to run once:
  pinMode(13,OUTPUT);
  pinMode(12,INPUT);
  pinMode(11,OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:

  if (digitalRead(12) == HIGH)
  {
    //do stuff
    digitalWrite(13,HIGH);
    digitalWrite(11,LOW);
  }
  else
  {
    //do other stuff
    digitalWrite(13,LOW);
    digitalWrite(11,HIGH);
  }
  
}