const int buttonPin = 2; // the number of the pushbutton pin
const int circuitPin = 8; // the number of the LED pin

// variables will change:
int buttonState = 0; // variable for reading the pushbutton status

void setup() {
// initialize the LED pin as an output:
pinMode(circuitPin, OUTPUT);
// initialize the pushbutton pin as an input:
pinMode(buttonPin, INPUT);
}

void loop() {
// read the state of the pushbutton value:
buttonState = digitalRead(buttonPin);

// check if the pushbutton is pressed.

const int buttonPin = 4;
const int circuitPin = 9;

int HasBeenSwitchedOn = 0;
int buttonState = 0; // variable for reading the pushbutton status

void setup() {
// initialize the LED pin as an output:
pinMode(circuitPin, OUTPUT);
// initialize the pushbutton pin as an input:
pinMode(buttonPin, INPUT);
}

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

if (buttonState == LOW) {
digitalWrite(circuitPin, LOW);

} else {
if (HasBeenSwitchedOn == 0) {
digitalWrite(circuitPin, HIGH);
HasBeenSwitchedOn = 1;