int x;
int state = 0;

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 button state

  // Toggle the state only when button is pressed
  if (x == LOW) { 
    state = !state;       // Toggle the state

    if (state == HIGH) {
      tone(4, 7000);      // Start tone at 7kHz
    } else {
      noTone(4);          // Stop the tone
    }

    // Wait until the button is released to avoid rapid toggling
    while (digitalRead(2) == LOW) {
      delay(10);          // Small delay to avoid CPU overuse
    }
  }
}