LED Button

const int buttonPin = 7;
const int ledPin =  13;

int buttonState = 0;  

void setup() {
  pinMode(ledPin, OUTPUT);    
  pinMode(buttonPin, INPUT);    
}

void loop(){
  buttonState = digitalRead(buttonPin);

  if (buttonState == HIGH) {    
    digitalWrite(ledPin, HIGH);
  }
  else {
    digitalWrite(ledPin, LOW);
  }
}