void setup() {
  Serial.begin(9600);
  pinMode(4,INPUT_PULLUP);
  pinMode(10, OUTPUT);

}

void loop() {
  
  int x = digitalRead(4);
  if( x==0 )
  {
    digitalWrite(10, HIGH);
    Serial.println(" Switch ON || Led ON ");
  }
  else
  {
    digitalWrite(10, LOW);
    Serial.println(" Switch OFF || Led OFF ");
  }
}