For loop SCL

const int SER =8;
const int LATCH =9;
const int CLK =10;
int lights[15] ={1, 2, 4, 8, 16, 32, 64, 128, 64, 32, 16, 8, 4, 2, 1};
int bar[15] = {1, 3, 7, 15, 31, 63, 127, 255, 127, 63, 31, 15, 7, 3, 1};

void setup()
{
 pinMode(SER, OUTPUT);
 pinMode(LATCH, OUTPUT);
 pinMode(CLK, OUTPUT);

 digitalWrite(LATCH, LOW);
 shiftOut(SER, CLK, MSBFIRST, B11111111);
 digitalWrite(LATCH, HIGH);


}

void loop()
{
 for (int i = 0; i < 15; i++)
 {
  digitalWrite(LATCH, LOW);
  shiftOut (SER, CLK, MSBFIRST, lights[i]);
  digitalWrite(LATCH, HIGH);
  delay(100);
 }
 for (int j = 0; j < 15; j++)
 {
   digitalWrite(LATCH, LOW);
   shiftOut( SER, CLK, MSBFIRST, bar[j]);
   digitalWrite(LATCH, HIGH);
   delay(100);
 }
}