Random Program LED Dice Activity

/*
 * Divya Inaganti
 * June 9, 2017
 * LED Dice Mini Project
 * Branching if - Random
 */
  const int pinLed1 = 2;
  const int pinLed2 = 7;
  const int pinLed3 = 4;
  const int pinButton = 8;
  boolean buttonDown = 0;
  boolean ledOn = 0;
  boolean lastButton = 0;
  int counter = 0;
void setup() {
  // put your setup code here, to run once:
pinMode (pinLed1, OUTPUT);
pinMode (pinLed2, OUTPUT);
pinMode (pinLed3, OUTPUT);
pinMode (pinButton, INPUT);

Serial. begin (9600);
randomSeed(analogRead(A0));
digitalWrite (pinLed1, HIGH);
digitalWrite (pinLed2, HIGH);
digitalWrite (pinLed3, HIGH);
delay(500);
digitalWrite (pinLed1, LOW);
digitalWrite (pinLed2, LOW);
digitalWrite (pinLed3, LOW);

}

void loop() {
  // put your main code here, to run repeatedly:
buttonDown = digitalRead(pinButton);
//Serial.print (buttonDown);


buttonDown = debounce(lastButton);      // will go and read the Button

if (lastButton == LOW && buttonDown == HIGH)    // Checks if the button has been pressed
{
  counter = random (1,5);
  Serial.println(counter);
}
switch (counter)
{
  case 1:
  digitalWrite(pinLed1, HIGH);
  digitalWrite(pinLed2, LOW);
  digitalWrite(pinLed3, LOW);
  break;
  case 2:
  digitalWrite(pinLed1, HIGH);
digitalWrite(pinLed2, HIGH);
digitalWrite(pinLed3, LOW);
break;
case 3:
 digitalWrite(pinLed1, HIGH);
digitalWrite(pinLed2, HIGH) ;
digitalWrite(pinLed3, HIGH);
break;
case 4:
  digitalWrite(pinLed1, LOW);
digitalWrite(pinLed2, LOW) ;
digitalWrite(pinLed3, LOW);
counter = 0;
break;
default:


//  else if(lastButton == HIGH && buttonDown == LOW)
 //{
 //Serial.print (0);
 //}

}
lastButton = buttonDown;

}

boolean debounce(boolean last)

{
  boolean current = digitalRead(pinButton);
  if (last != current)
  {
    delay(5);
    current = digitalRead(pinButton);
  }
  return current;
}