int button1=18;    //3;
int button2=22;    //4;
int button3=21;   //5;
int button4=19;    //6;
int NUM_A,NUM_B;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32-S2!");
  pinMode(button1,INPUT);
  pinMode(button2,INPUT);
  pinMode(button3,INPUT);
  pinMode(button4,INPUT);
  NUM_A=0,NUM_B=0;
}

void loop() {
  if(digitalRead(button1)==LOW&&NUM_A>=0&&NUM_A<99)
  {while(digitalRead(button1)==LOW)
    delay(100);
    NUM_A++;
  }
  else if(digitalRead(button2)==LOW&&NUM_A>0&&NUM_A<=99)
  {while(digitalRead(button2)==LOW)
    delay(100);
    NUM_A--;
  }

  if(digitalRead(button3)==LOW&&NUM_B>=0&&NUM_B<99)
  {while(digitalRead(button3)==LOW)
    delay(100);
    NUM_B++;
  }
  else if(digitalRead(button4)==LOW&&NUM_B>0&&NUM_B<=99)
  {while(digitalRead(button4)==LOW)
    delay(100);
    NUM_B--;
  }
delay(10);
 // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
  Serial.print("NUM_A=");
  Serial.print(NUM_A);
  Serial.print(", NUM_B=");
  Serial.println(NUM_B);
}