Untitled

const uint8_t buttonPins[] = {2, 3, 4, 5};

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

  for (int i = 0; i < 4; i++) {
    pinMode(buttonPins[i], INPUT_PULLUP);
  }
}

void loop() {
  for (int i = 0; i < 4; i++) {
    if (digitalRead(buttonPins[i]) == LOW) {  
      Serial.print("Button ");
      Serial.print(i + 1);  
      Serial.println(" is pressed");
      delay(200);  
    }
  }
}