Donovic Arduino

#define NO_LEDS 4
#define FADE_AMOUNT 5
#define DOWN 1
#define UP 0

int ledArr[NO_LEDS] = {11};
int brightnessArr[NO_LEDS] = {};
int flag = UP;
int z = 0;
int adder = 1;

void setup() {
  // declare pin 9 to be an output:
  int i = 0;
  while ( i < NO_LEDS ) {
    pinMode(ledArr[i], OUTPUT);
    i++;
  }

}

void loop() {

  if ( brightnessArr[z] >= 255 ) {
    flag = DOWN;
  }else if (brightnessArr[z] == 0 ) {
    flag = UP;
  }

  analogWrite(ledArr[z], brightnessArr[z]);
  delay(30);

  if ( flag == DOWN ) {
    brightnessArr[z] -= FADE_AMOUNT;
  }else{
    brightnessArr[z] += FADE_AMOUNT;
  }

  int j = 0;
  while ( j < NO_LEDS ) {
    if ( brightnessArr[z] >= 255 ) {
      adder = -1;
    }else if (brightnessArr[z] == 0) {
      adder = 1;
    }
    j++;


  }

  z += adder;


}