int pinLed[] = {0,1,2,3,4,5,6,7};
int i,j;
void battraiphai()
{
  for (i=0;i<8;i++) {
  digitalWrite(pinLed[i],HIGH);
  delay(300);
}
}
void tattraiphai(){
static int chay3=0;
for(chay3=0;chay3<8;chay3++)
  {
    digitalWrite(pinLed[chay3],LOW);
    delay(300);
  }
} 
  void setup()
  {
    pinMode(pinLed[i],OUTPUT);
  }
  void loop()
  {
    battraiphai();
    tattraiphai();
  }