const int ledPin = 13;
const int buttonPin = 2;
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);
 }
}