#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 10, 9, 8, 7);
bool button = true;

void setup() {
  lcd.begin(0, 0);
  lcd.print("X");
  pinMode(3, INPUT);
}

void loop() {
  if(digitalRead(3)==HIGH){
    button = false;
    lcd.scrollDisplayRight();
    delay(200);
  }
  else{
    lcd.scrollDisplayLeft();
    delay(200);
  }
}