int button = 2;
int led = 3;
int buttonStatus =0;

void setup()
 {
  pinMode(led, OUTPUT);
  pinMode(button, INPUT);
}

void loop() {
   buttonStatus =digitalRead(button);
   if (buttonStatus == HIGH) 
   {
    digitalWrite(led, HIGH);
   }
   else
   {
    digitalWrite(led, LOW);
   }
}