int LED_PIN = 8;
int BUTTON_PIN = 7;
void setup()
{
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUTTON_PIN,INPUT);
}
void loop()
{
  if(digitalRead(BUTTON_PIN)==HIGH)
  {
    digitalWrite(LED_PIN, HIGH);
  }
  else
  {
    digitalWrite(LED_PIN, LOW);
  }
}