#include <LiquidCrystal.h>

LiquidCrystal lcd(12,11,10,9,8,7); // RS,E...D7

int buttonG = 6;
int buttonB = 5;
int buttonR = 4;
int buttonY = 3;
int num = 0;
int m = 0;

void setup() {
  randomSeed(analogRead(A0));
  lcd.begin(16,2); // 16 stolpcev in 2 vrstici
  pinMode(buttonG, INPUT_PULLUP);
  pinMode(buttonB, INPUT_PULLUP);
  pinMode(buttonR, INPUT_PULLUP);
  pinMode(buttonY, INPUT_PULLUP);
}

void loop() {
  ifs();
  //switch_case();
}

void numPrint(int y){
  lcd.setCursor(0,0);
  lcd.clear();
  lcd.print(y);
}

void ifs(){
  if(digitalRead(buttonG) == LOW){
    num++;
    numPrint(num);
    while(digitalRead(buttonG) == LOW) delay(100);
  }
  else if(digitalRead(buttonB) == LOW){
    num--;
    numPrint(num);
    while(digitalRead(buttonB) == LOW) delay(100);
  }
  else if(digitalRead(buttonR) == LOW){
    num = 0;
    lcd.clear();
    numPrint(num);
    while(digitalRead(buttonR) == LOW) delay(100);
  }
  else if(digitalRead(buttonY) == LOW){
    num = random(1, 10);
    numPrint(num);
    while(digitalRead(buttonY) == LOW) delay(100);
  }
  delay(50);
}

void switch_case(){
  if(digitalRead(buttonG) == LOW) m = 1;
  else if(digitalRead(buttonB) == LOW) m = 2;
  else if(digitalRead(buttonR) == LOW) m = 3;
  else if(digitalRead(buttonY) == LOW) m = 4;
  else m = 0;

  switch(m){
    case 1:
      num++;
      numPrint(num);
      while(digitalRead(buttonG) == LOW) delay(100);
      break;
    case 2:
      num--;
      numPrint(num);
      while(digitalRead(buttonB) == LOW) delay(100);
      break;
    case 3:
      num = 0;
      numPrint(num);
      while(digitalRead(buttonR) == LOW) delay(100);
      break;
    case 4:
      num = random(1, 10);
      numPrint(num);
      while(digitalRead(buttonY) == LOW) delay(100);
      break;
    default:
      delay(50);
  }
  delay(50);
}