//creating global variable
int summation = 0;

int local_addition(int a, int b){
  //creating a local variable
  int sum = a + b;
  return sum;
}

void global_addition(int a, int b){
  //accessing the global variable
  summation = a + b;
}

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  summation = local_addition(9,4);
  Serial.print("Local summation:");
  Serial.println(summation);
  delay(1000);

  global_addition(8, 9);
  Serial.print("Global summation:");
  Serial.println(summation);
}

void loop() {
  // put your main code here, to run repeatedly:
  
  
  // infinite while loop to stop printing again and again.
  //while (true){
  //}

}