int a=5;
int b=10;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
}

void loop() {
  // put your main code here, to run repeatedly:
  Serial.print("++a =");
  ++a;
  Serial.println(a);
  Serial.print("a++ =");
  a++;
  Serial.println(a);
  Serial.print("--b =");
  --b;
  Serial.println(b);
  Serial.print("b-- =");
  b--;
  Serial.println(b);

  delay(1000); // this speeds up the simulation
}