int num1, num2;
char op;

void setup() {
  Serial.begin(9600);
  Serial.println("Enter first number:");
  while (Serial.available() == 0); // Wait for input
  num1 = Serial.parseInt();
  Serial.read(); // Consume the newline character
  
  Serial.println("Enter operator (+, -, *, /):");
  while (Serial.available() == 0);
  op = Serial.read();
  Serial.read(); // Consume the newline character
  
  Serial.println("Enter second number:");
  while (Serial.available() == 0);
  num2 = Serial.parseInt();
  Serial.read(); // Consume the newline character
  
  if (op == '+') {
    Serial.print("Result: ");
    Serial.println(num1 + num2);
  } else if (op == '-') {
    Serial.print("Result: ");
    Serial.println(num1 - num2);
  } else if (op == '*') {
    Serial.print("Result: ");
    Serial.println(num1 * num2);
  } else if (op == '/') {
    if (num2 != 0) {
      Serial.print("Result: ");
      Serial.println(num1 / num2);
    } else {
      Serial.println("Error: Division by zero");
    }
  } else {
    Serial.println("Invalid operator");
  }
}

void loop() {
  // Empty loop
}