Arduino not working after a while -

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my arduino stops working after while. here's code:

//pin.h header file  #ifndef pin_h #define pin_h  class pin{   public:    pin(byte pin);    void on();//turn led on    void off();//turn led off    void input();//input pin    void output();//output pin    private:     byte _pin;     };  #endif   //pin.cpp members definitions #include "arduino.h" #include "pin.h"  pin::pin(byte pin){//default constructor    this->_pin = pin; }  void pin::input(){   pinmode(this->_pin, input); }  void pin::output(){   pinmode(this->_pin, output); }  void pin::on(){   digitalwrite(this->_pin, 1);//1 equal high }  void pin::off(){   digitalwrite(this->_pin, 0);//0 equal low }   //this main code .ino #include "pin.h"  pin led[3] = {//array of objects  pin(11),  pin(12),  pin(13) };  const byte max = sizeof(led);  //main program---------------------------------------------------------------------------------- void setup() {   for(int = 0; < max; i++){       led[i].output();   }//end loop initialize led output }//end setup  int = 0;  void loop() {   for(i = 0; < 3; i++){     led[i].on();     delay(1000);   }    for(i = 3; >= 0; i--){     led[i].off();     delay(1000);   }  }//end loop //see class definition @ pin.h //see class members @ pin.cpp

my arduino stops working when use 2 loops inside void loop function, if use code below in main, works fine. why arduino stop after while when using loops?

void loop() {   led[0].on();   delay(1000);    led[1].on();   delay(1000);    led[2].on();   delay(1000);    led[2].off();   delay(1000);    led[1].off();   delay(1000);    led[0].off();   delay(1000);   }//end loop

this because start second loop = 3...

void loop() {   for(i = 0; < 3; i++){     led[i].on();     delay(1000);   }    for(i = 3; >= 0; i--){     led[i].off(); // causes crash on first run led[3] out of range...     delay(1000);   }  }//end loop

also, want replace these '3' 'max', when change size, don't have rewrite everywhere...

void loop() {   for(i = 0; < max; i++){     led[i].on();     delay(1000);   }    for(i = max - 1; >= 0; i--){     led[i].off();     delay(1000);   }  }//end loop

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