Sequential LED Lighting

/* SEQUENTIAL LEDS
 * by Jomar B Amaral
 * jomar.amaral@gmail.com for more information
 * with small modifications on this code many different sequences are possible
 */

int ledPin[] = {38, 40, 42, 44, 46, 48, 50, 52}; //pins used, you can modify to you arduino board
int i = 38; //you can modify to you arduino board, i is the first pin your led is connected
int x = 52; //you can modify to you arduino board, x is the last pin your led is connected

void setup()
{
  for (int j=0; j<9; j++)
  {
   pinMode(ledPin[j], OUTPUT); // configura pino digital como sada
  }
}

void loop()
{
   for (i; i <= 52; i++)
    {
   digitalWrite(i,HIGH);
   delay(100);  // optional delay, in this case leds turn on one by one by 100 ms
    }
  {
    for (x; x >= 38; x--)
    {
    digitalWrite(x,LOW);
    delay(100);  //leds turn off one by one by 100 ms
    }
     {
      x=52; //optional
      i=38; //optional
      }
   }
}