static_sample_d.ino

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

void loop (){
  a_function();
//  Serial.print("In loop: ");
//  Serial.println(local_variable);  // local_variable is out of scope so compilation will produce an error message
  delay(1000);
}

void a_function(){
  static int local_variable = 0;
  Serial.print("In a_function: ");
  Serial.println(local_variable);
  local_variable++;
}