//BTNPIN defines the arduino input in to which
//the button is connected
const int BTNPIN = 2;
const int ledPin = 10;

//btnState stores the current button state (HIGH or LOW)
//initialize it to LOW  so the LED stays off until the sketch
//reads a HIGH state for the button input 
int btnState = LOW;

void setup() {
  //the setup function runs once every time the arduino
  //powers up or resets (after sketch update for example)
  
  //initialize the digital pin ledPin as output
  pinMode(ledPin, OUTPUT);
  //initialize push button pin as an input 
  pinMode(BTNPIN, INPUT);
  //set the initial state of the LED (off)
  digitalWrite(ledPin, btnState);

}

  // the loop function rns repeatedly as long as a sketch is
  //loaded and the arduino has power.
void loop() {
  //read the state of the button; it's a digital input,
  //so possible returned values are HIGH or LOW.
  btnState = digitalRead(BTNPIN)
  //use the measured value to set the LED state
  digitalWrite(ledPin, btnState);
  //this whole function can be simplified to hte following
  //single line of code:
  //digitalWrite(ledPin, digitalRead(BTNPIN))



}