int buzzerPin = 9;
int buttonPin = 7;
int ledPin = 6;
const int toneFreq = 523;

void setup()
{
pinMode(buzzerPin, OUTPUT);
pinMode(ledPin, OUTPUT);
pinMode(buttonPin, INPUT);
}

void loop() 
{
int buttonState = digitalRead(buttonPin);
if (buttonState==LOW)
{
digitalWrite(ledPin, HIGH);
tone(buzzerPin, toneFreq);
}
else
{
digitalWrite(ledPin, LOW);
noTone(buzzerPin);
}
}