int buttonPin = 2;
int LEDPin = 13;
bool LEDOn = true;
void setup() {
  // put your setup code here, to run once:
 pinMode(buttonPin, INPUT);
 pinMode(LEDPin, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
 bool buttonPressed = digitalRead(buttonPin);

if (buttonPressed){
  if (LEDOn==true){
    digitalWrite(LEDPin, LOW);
  LEDOn = false;
  } else {
    digitalWrite(LEDPin, HIGH);
    LEDOn = true;
  }
}
}