Push Button Alarm System - Wokwi ESP32, STM32, Arduino Simulator

#define sw 5
void setup() {
  pinMode(sw,INPUT);
  pinMode(4, OUTPUT);
}
void loop() {
  int a= digitalRead(sw);
  if(a==HIGH){
    digitalWrite(4,HIGH);
  }
  else{
    digitalWrite(4,LOW);
  }
}