class RegisterControlar{
    private:
      byte data;
      byte latch;
      byte clock;

      byte registerCount;

      byte PINs[2][4]={
        {B10000000,B01000000,B0010000,B00010000},
        {B00001000,B00000100,B00000010,B00000001}
      };

      byte PIN[8]={
        B10000000,B01000000,B0010000,B00010000,
        B00001000,B00000100,B00000010,B00000001
      };

    public:
      RegisterControlar(byte registerCount,byte data,byte latch,byte clock){
        this->registerCount = registerCount;
        this->data = data;
        this->latch = latch;
        this->clock = clock;
      }
      void init(){
        pinMode(data, OUTPUT);
        pinMode(latch, OUTPUT);
        pinMode(clock, OUTPUT);
      }
      void setPin(int registerNum,byte pin){ // register number 0 is the last register
        if(registerNum > registerCount){
          registerNum = registerCount - 1;
        }
        if(registerNum < 0){
          registerNum = 0;
        }
        //---------------------------------
        if(pin < 8 && pin >= 0){
          digitalWrite(latch, LOW);
          for(int i = 0; i < registerCount;i++){
            if(registerNum == i){
              shiftOut(data,clock,LSBFIRST,PIN[pin]);
            }else{
              shiftOut(data,clock,LSBFIRST,B00000000);
            }
          }
          digitalWrite(latch, HIGH);
        }
        //---------------------------------
      }
};

#define data 3
#define latch 4
#define clock 5

RegisterControlar Rcontrolar(4,data,latch,clock);

void setup() {
  Rcontrolar.init();
  Rcontrolar.setPin(1,4);
  

}

void loop() {
  // put your main code here, to run repeatedly:

}