#include <LiquidCrystal.h>
LiquidCrystal lcd(12,11,10,9,8,7);    //RS, E, D4 .... D7

void setup() {
  lcd.begin(16,2);    //16 stolpcev in 2 vrstici
  pinMode(0, INPUT_PULLUP);
  pinMode(1, INPUT_PULLUP);
  pinMode(2, INPUT_PULLUP);
  pinMode(3, INPUT_PULLUP);
  randomSeed(analogRead(A0));
}

void loop() {
  static int counter= 0;
  int m = 0;
  int value = analogRead(A0);

  if(digitalRead(0) == LOW) m=1;
  if(digitalRead(1) == LOW) m=2;
  if(digitalRead(2) == LOW) m=3;
  if(digitalRead(3) == LOW) m=4;

  switch(m) {
    case 1: {
      m = 0;
      counter++;
      break;
      }

    case 2: {
      m = 0;
      counter--;
      break;
      }

    case 3: {
      m = 0;
      counter=0;
      break;
      }

    case 4: {
      m = 0;
      counter= random(1,10);
      break;
      }

    default: {
      m = 0;
      break;
      }  
  }

  lcd.clear();
  lcd.print(counter);
  delay(300);
}