const int led1 = 2;
const int led2 =3;
const int buttonPin = 4;

bool ledState = false;

unsigned long previousMillis = 0;

void setup() {
  // put your setup code here, to run once:
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP);
}

void loop() {
  // put your main code here, to run repeatedly:
  //blink Led1
  if (millis() - previousMillis >= 3000){
    previousMillis = millis();

    ledState = !ledState;

    digitalWrite(led1, ledState);
  }

  if (digitalRead(buttonPin) == LOW){

    digitalWrite(led2, HIGH);

  }else{
    digitalWrite(led1, ledState);

  }

//task 2: read button contiuously
  if (digitalRead(buttonPin) == LOW){
    digitalWrite(led2, HIGH);
  }else{
    digitalWrite(led2, LOW);
  }

}