void setup() {
  pinMode(7, OUTPUT);  // LED
  pinMode(4, INPUT);   // Button
}

void loop() {
  if (digitalRead(4) == HIGH) {
    digitalWrite(7, HIGH);     // Turn ON LED
    tone(2, 1000);              // Play 1kHz sound
  } else {
    digitalWrite(7, LOW);       // Turn OFF LED
    noTone(2);                  // Stop buzzer
  }
}