Something Awesome

#define NO_OF_PINS 4
#define MAX_BRIGHTNESS 255

int ledArr[NO_OF_PINS] = {11,10,9,6};
int brightnessArr[NO_OF_PINS] = {};
int brightness = 0;
int fade = 10;
int i = 0;
int flag = false;

void setup() {
  //iterate over ledArr to initialse the led pins.
  int x = 0;
  while (x < NO_OF_PINS) {
    pinMode(ledArr[x], OUTPUT);
    brightnessArr[x] = brightness;
    x++;
  }

}

void loop() {


  //checks to see if we reverse the order or not
  int z = 0;
  while ( z < 4) {
    if ( brightnessArr[z] == MAX_BRIGHTNESS ) {
      flag == true;
    } else {
      flag == false;
    }
    z++;
  }

  //adds or subtracts brightness based on whether
  //or not we are going up or down the scale
  if ( flag == false ) {
    brightnessArr[i] += fade;
  } else if ( flag == true ) {
    brightnessArr[i] -= fade;
  }


  //first we increment brightness one pin at a time.
  if (brightnessArr[i] == MAX_BRIGHTNESS && flag == true) {
    i++;
  }else if(brightnessArr[i] == 0 && flag == false) {
    i--;
  }
  analogWrite(ledArr[i], brightnessArr[i]);
  delay(30);
}