byte pin[] = {2,4,5,18,19,21,22};
uint8_t LEFT_SWITCH = 23;
int number = 0;
bool isLeftSwitchOn = false;

const byte count[10] = {  // this is data code for Seven segment 
  //GFEDCBA
  B01000000,  //0
  B01111001, // 1
  B00100100, // 2
  B00110000, //3
  B00011001, //4
  B00010010, //5
  B00000010, //6
  B01111000, //7
  B00000000, //8
  B00010000, //9
};

void setup() {
  Serial.begin(115200);
  pinMode(pin[0], OUTPUT);  // every pin is output
  pinMode(pin[1], OUTPUT);
  pinMode(pin[2], OUTPUT);
  pinMode(pin[3], OUTPUT);
  pinMode(pin[4], OUTPUT);
  pinMode(pin[5], OUTPUT);
  pinMode(pin[6], OUTPUT);
  pinMode(LEFT_SWITCH, INPUT_PULLUP);

  digitalWrite(pin[0], LOW);
  digitalWrite(pin[1], LOW);
  digitalWrite(pin[2], LOW);
  digitalWrite(pin[3], LOW);
  digitalWrite(pin[4], LOW);
  digitalWrite(pin[5], LOW);
  digitalWrite(pin[6], LOW);
}

void loop() {
  if (digitalRead(LEFT_SWITCH) == LOW) {
    AddNumber();
    Serial.printf("On Pressing state = %s \n",isLeftSwitchOn ? "ON" : "OFF");
    delay(200);
    while(digitalRead(LEFT_SWITCH) == LOW) {
      Serial.printf("On  Exist state = %s \n",isLeftSwitchOn ? "ON" : "OFF");
    }
  } 

  // if (isLeftSwitchOn) {
  //   SevenSeg(count[number]);
  // } else {
  //   number--;
  SevenSeg(count[1]);
  // }

  // for(int i = 0; i<10; i++){ // printing the number on seven segment
    // SevenSeg(count[i]);
    // digitalWrite(pin[0], LOW);
    // digitalWrite(pin[1], LOW);
    // digitalWrite(pin[2], LOW);
    // digitalWrite(pin[3], LOW);
    // digitalWrite(pin[4], LOW);
    // digitalWrite(pin[5], LOW);
    // digitalWrite(pin[6], HIGH);

    // for(int i=0; i<8; i++) {
    //   digitalWrite(pin[i],bitRead(1,i));
    // }
    delay(1000);
  // }

}

void AddNumber() {
  number++;
  if (number > 10) {
    number = 0;
  } else if (number < 0) {
    number = 9;
  }
}

void SevenSeg(byte Bit) { //  sending data on each pin
  for(int i=0; i<8; i++)
  digitalWrite(pin[i],bitRead(Bit,i));
}