Arduino Door bell project

// C++ code
//
int led = 4;
int button =2;
int buzzer =3;

void setup()
{
  pinMode(led, OUTPUT);
  pinMode (buzzer, OUTPUT);
  pinMode(button, INPUT);
  
}

void loop()
{
 int a =digitalRead(2);
  if(a==1){
    digitalWrite(led, HIGH);
    digitalWrite(buzzer, HIGH);
}
  else{
    digitalWrite(led, LOW);
    digitalWrite(buzzer, LOW);
}
}