// Function Declaration (Prototype)
int add(int a, int b);  

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

void loop() {
  int num1 = 9, num2 = 1;
  
  // Function Calling
  int result = add(num1, num2);
  
  // Display result
  Serial.print("Sum of ");
  Serial.print(num1);
  Serial.print(" and ");
  Serial.print(num2);
  Serial.print(" is: ");
  Serial.println(result);
  delay(2000); // Wait for 2 seconds
}

// Function Definition
int add(int a, int b) {
  return a + b; 
}