void setup() {
  Serial.begin(9600); // Start Serial Monitor

  int num1 = 10;
  int num2 = 5;

  Serial.print("Addition: ");
  Serial.println(num1 + num2);

  Serial.print("Subtraction: ");
  Serial.println(num1 - num2);

  Serial.print("Multiplication: ");
  Serial.println(num1 * num2);

  Serial.print("Division: ");
  if (num2 != 0) {
    Serial.println(num1 / num2);
  } else {
    Serial.println("Error! Division by zero.");
  }
}

void loop() {
  // Nothing here, since the calculations run once in setup()
}