class Sevensegment { //add new class to write a number
  private:
    byte _LED_A; //attributes for class "Sevensegment",  
    byte _LED_B;
    byte _LED_C;
    byte _LED_D;
    byte _LED_E;
    byte _LED_F;
    byte _LED_G;
    byte _LED_DP; 

  public:
    Sevensegment(){} //default constructor, no one needs
    Sevensegment(byte LED_A, byte LED_B, byte LED_C, byte LED_D, byte LED_E, byte LED_F, byte LED_G, byte LED_DP){ // constructor with all parameters (pins) a new display has
      _LED_A = LED_A; // set the attributes of the object (display) to the parameters it was given by the constructor 
      _LED_B = LED_B;
      _LED_C = LED_C;
      _LED_D = LED_D;
      _LED_E = LED_E;
      _LED_F = LED_F;
      _LED_G = LED_G;
      _LED_DP = LED_DP;
    }

  
  void init(){ //initialize the new display by setting all pins to output
    pinMode(_LED_A,OUTPUT);
    pinMode(_LED_B,OUTPUT);
    pinMode(_LED_C,OUTPUT);
    pinMode(_LED_D,OUTPUT);
    pinMode(_LED_E,OUTPUT);
    pinMode(_LED_F,OUTPUT);
    pinMode(_LED_G,OUTPUT);
    pinMode(_LED_DP,OUTPUT);

  }

  void print(int number){ //print some number to the new display (object)
    boolean digit[10] [8]{ //define the pins x, that have to be turned on to show the number y
      {1,1,1,1,1,1,0,0},
      {0,1,1,0,0,0,0,0},
      {1,1,0,1,1,0,1,0},
      {1,1,1,1,0,0,1,0},
      {0,1,1,0,0,1,1,0},
      {1,0,1,1,0,1,1,0},
      {1,0,1,1,1,1,1,0},
      {1,1,1,0,0,0,0,0},
      {1,1,1,1,1,1,1,0},
      {1,1,1,1,0,1,1,0},
    };

    int ledPin[] = {_LED_A, _LED_B, _LED_C, _LED_D, _LED_E, _LED_F, _LED_G, _LED_DP }; //define the order of LEDs in the display

    for(int i = 0; i <= 7; i++){
      digitalWrite(ledPin[i],!digit[number] [i]); //turn on all necessary LEDs, !:because active low 
    }
  }

  void clear(){ //clear the display by setting all pins to HIGH (active LOW -> turn off)
    int ledPin[] = {_LED_A, _LED_B, _LED_C, _LED_D, _LED_E, _LED_F, _LED_G, _LED_DP }; //define the order of LEDs in the display
    for(int i = 0; i <= 7; i++){ 
      digitalWrite(ledPin[i],HIGH);
    }
  }

};

Sevensegment display1(7/*LED_A*/,6/*LED_B*/,3/*LED_C*/,4/*LED_D*/,5/*LED_E*/,8/*LED_F*/,9/*LED_G*/,2/*LED_DP*/); // call the constructor and create new display object and define pins the LEDs are connected to 

void setup() {
  display1.init(); //initialize the display
}

void loop() { //print all digits and wait 1s
  for(int i = 0; i<=9; i++){
    display1.print(i);
    delay(1000);
    display1.clear();
  }
}