int buttonPin = 7;
int buzzerPin = 8;
int ledPin = 2;

void setup() {
  Serial.begin(9600);

  pinMode(7, INPUT);
  pinMode(8, OUTPUT);
  pinMode(2, OUTPUT);
}

void loop() {
  int x = digitalRead(7);

  if (x == HIGH) {
    tone(8, 450);      
    digitalWrite(2, HIGH); 
  } else {
    noTone(8);         
    digitalWrite(2, LOW); 
  }
}