// LCD1602 to Arduino Uno connection example

#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 10, 9, 8, 7);
int counter, m;
void setup() {
  lcd.begin(16, 2);
  randomSeed(analogRead(A0));
  for(int x = 2; x < 6; x++){
    pinMode(x, INPUT_PULLUP);
  }
}

void loop() {
  if(digitalRead(5) == LOW){
    //counter++;
    //delay(200);
    m=1;
  } 
 if(digitalRead(4) == LOW){
  //counter--;
  //delay(200);
    m=2;
 } 
 if(digitalRead(3) == LOW){
   //counter=0;
   //delay(200);
   m=3;
 }
 if(digitalRead(2) == LOW) m=4; //counter=random(1,10);
switch (m) {
  case 1:{  m=5;
            counter++;
            break; }
  case 2:{  m=5;
            counter--;
            break; }
  case 3:{  m=5;
            counter=0;
            break; }
  case 4:{  m=5;
            counter = random(1,10);
            break; }
 
}
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print(counter);
  delay(200);
}