Physical_computing_lightUp3Leds

gistfile1.txt

// to illuminate 3 leds
int ledArray[ ] = {2,4,7};

void setup() {
  for(int i = 0, i < 3, i++) {
  pinMode(ledArray[i], OUTPUT);
  }
}

void loop() {
  // put your setup code here, to run once:
  lightup();
  
  }

void lightup() {
  // put your main code here, to run repeatedly:
  
  for(int j = 0, j <= 2, j++) {
  digitalWrite(ledArray[j], HIGH);
  delay(1000);
  
  }

for(int k = 2, k >= 0, k--) {
  digitalWrite(ledArray[k], LOW);
  delay(1000);
 }
}

This code looks fine, other than your comments being in the wrong section