#include <LiquidCrystal.h>

LiquidCrystal lcd(12, 11, 10, 9, 8, 7);
int st = 0;
int prstPin = 2;
int odstPin = 3;
int nullPin = 4;
int rndPin = 5;
int randNum;
String a = "Stevec: ";

void setup() {
  randomSeed(analogRead(A0));
  pinMode(prstPin, INPUT_PULLUP);
  pinMode(odstPin, INPUT_PULLUP);
  pinMode(nullPin, INPUT_PULLUP);
  pinMode(rndPin, INPUT_PULLUP);
  lcd.begin(16, 2);
  lcd.setCursor(0, 0);
  lcd.print(a);
}

void loop() {
  lcd.setCursor(8, 0);
  lcd.print(st);
  int buttonState;
  buttonState = digitalRead(prstPin);
  switch (buttonState) {
    case LOW:
      st++;
      break;
  }
  buttonState = digitalRead(odstPin);
  switch (buttonState) {
    case LOW:
      st--;
      break;
  }
  buttonState = digitalRead(nullPin);
  switch (buttonState) {
    case LOW:
      st = 000;
      break;
  }
  buttonState = digitalRead(rndPin);
  switch (buttonState) {
    case LOW:
      randNum = random(1, 10);
      st = st + randNum;
      break;
  }
  delay(200);
}