int LED_PIN = 12;
int SWITCH_PIN = 2;
bool switchState = false;
void setup() {
  // put your setup code here, to run once:
   pinMode(LED_PIN, OUTPUT); // LED
   pinMode(SWITCH_PIN, INPUT); // SWITCH
}

void loop() {
  // put your main code here, to run repeatedly:
   switchState = digitalRead(SWITCH_PIN);

   if(switchState == HIGH){
        // Turn on the led
        digitalWrite(LED_PIN, HIGH);
   }else{
        digitalWrite(LED_PIN, LOW);
   }
}