void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
}
int x =1;
int y =1;
int a =1;
int b =1;
int c =1;
int d =1;
int e =1;
int f =1;
int g =1;
int h =1;

void loop() { Serial.print("x =");
 Serial.println(x);
 Serial.print("x+2 ,x= ");
 Serial.println(x+=2);
 Serial.println("------------");
 delay(1000);
 Serial.print("y =");
 Serial.println(y);
 Serial.print("y-2 ,y= ");
 Serial.println(y-=2);
 Serial.println("------------");
 delay(1000);
Serial.print("a =");
 Serial.println(a);
 Serial.print("a*2 ,x= ");
 Serial.println(a*=2);
 Serial.println("------------");
 delay(1000);
 Serial.print("b =");
 Serial.println(b);
 Serial.print("b/2 ,y= ");
 Serial.println(b/=2);
 Serial.println("------------");
 delay(1000);
 Serial.print("c =");
 Serial.println(c);
 Serial.print("c%2 ,x= ");
 Serial.println(c%=2);
 Serial.println("------------");
 delay(1000);
 Serial.print("d =");
 Serial.println(d);
 Serial.print("d>>2 ,y= ");
 Serial.println(d>>=2);
 Serial.println("------------");
 delay(1000);
 Serial.print("e =");
 Serial.println(e);
 Serial.print("e<<2 ,x= ");
 Serial.println(e<<=2);
 Serial.println("------------");
 delay(1000);
 Serial.print("f =");
 Serial.println(f);
 Serial.print("f&2 ,y= ");
 Serial.println(f&=2);
 Serial.println("------------");
 delay(1000);
 Serial.print("g =");
 Serial.println(g);
 Serial.print("g^2 ,x= ");
 Serial.println(g^=2);
 Serial.println("------------");
 delay(1000);
 Serial.print("h =");
 Serial.println(h);
 Serial.print("h|2 ,y= ");
 Serial.println(h|=2);
 Serial.println("------------");
 delay(1000);
 }