trigger led after led at HIGH input

Other Hardware LEDs and Multiplexing
11

hey,

here is my modified code for selecting forth or back. it works fine. the next question is .. how iam able to let it count random?
thank you

// Number of Button location
int buttonPin = 22;     

// Array of where leds are
int ledPinArray[] = {30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45};
// Current location in array
int pos = 0;

// read button state
int buttonState = 0;  
int mode1 = 8;
int mode2 = 9;
int mode1status;
int mode2status;


void setup() {
  // initialize the LEDs as an output
  for(int i = 0; i < 16; i++)
  //for(int i = 15; i > 16; i--) 
  { // Change 4 to length of array
    pinMode(ledPinArray[i],OUTPUT);
  }
  
  // Accept inputs from button pin
  pinMode(buttonPin, INPUT);    
  
  // Turn on the first LED
  digitalWrite(ledPinArray[0],HIGH); 
  //digitalWrite(30,HIGH);
  
}

void vor()
{ 
  // read the state of the pushbutton
  buttonState = digitalRead(buttonPin);

   // if the button is preseed
  if (buttonState == HIGH) {     

    // increment location in Array
    pos++;
    
    // if the location is higher than the length of the array, set it back to 0
    if(pos >= 16) {
      pos = 0;
    }
    
    // turn on next LED
    digitalWrite(ledPinArray[pos], HIGH);  
    
    // Turns off last LED
    if(pos!=0) { // If the current possition isnt the first in the row
      digitalWrite(ledPinArray[pos-1], LOW);
    } else { // If it is, turn off the last one
      digitalWrite(ledPinArray[15],LOW);
    }
    
    // without this, it will change LED's faster than you can let go of the button
    delay(10);
    
  }
}
  
void back(){
   // read the state of the pushbutton
  buttonState = digitalRead(buttonPin);

   // if the button is preseed
  if (buttonState == HIGH) {     

    // increment location in Array
    pos--;
    
    // if the location is higher than the length of the array, set it back to 0
    if(pos <= -1) {
      pos = 15;
    }
    
    // turn on next LED
    digitalWrite(ledPinArray[pos], HIGH);  
    
    // Turns off last LED
    if(pos!=15) { // If the current possition isnt the first in the row
      digitalWrite(ledPinArray[pos+1], LOW);
    } else { // If it is, turn off the first one
      digitalWrite(ledPinArray[0],LOW);
    }
    
    // without this, it will change LED's faster than you can let go of the button
    delay(10);
    
  }
}
  
void zufall();



void loop(){
  mode1status = digitalRead(mode1);
  mode2status = digitalRead(mode2);
    {if(mode1status == LOW)
      vor();
    else
      back();}
    
    {if(mode2status == HIGH)
      zufall();
    else
      vor();
    }
  
  
 

}