int x;
void setup() {
  pinMode(2, INPUT);  // Set pin 2 as input (pull-up)
  pinMode(4, OUTPUT); // Set pin 4 as output
}

void loop() {
  x = digitalRead(2); // Read the state of the push button

  if (x == LOW) {            // If the button is pressed
    tone(4, 7000 , 250);  // Play a 262Hz tone for 250 milliseconds
  } else {
    noTone(4);          // Turn the buzzer off
  }
}