//Created by Barbu Vulc!
/*
 * This project is based on an Arduino-Ardublock sketch
 * for Sparkfun Digital Sandbox board called 'Serial Calculator'!
 */
//LCD library:
#include <LiquidCrystal.h>
//LCD set on digital pins from 7 to 12!
LiquidCrystal lcd(7, 8, 9, 10, 11, 12);
//'n' is the value multiplied by 2...
long n, m, k;

void setup(){
  lcd.begin(16, 2);
  //Prints "Multiplication by 2" for 3 seconds!
  lcd.setCursor(0, 0);
  lcd.print("Multiplication");
  lcd.setCursor(0, 1);
	lcd.print("    by 2!");
  delay(3000);
  lcd.clear();
	//'n' initialization!
  n = 1;
	//We need 'm' for 'k' and 'k' for a bit later! ;)
	m = 32768;  k = (m*m)*-2;
}

void loop(){
	//Multiplication begin with '1'.
	do{
		lcd.setCursor(0, 0);
		lcd.print(n);
		delay(1000);
		//Prints 'Operation done!', 1 second after n = k!
		//'k' is a huge number, but is an error!
		if(n == k){
			lcd.setCursor(1, 1);
		  lcd.print("Error!");
		  delay(1000);
			lcd.clear();
			lcd.setCursor(0, 0);
		  lcd.print("Operation done!");
		  delay(2000);
		  lcd.clear();
		}
	}while(n = n * 2);
	//Repeat the whole process => Infinite loop! :))
	lcd.setCursor(0, 0);
	lcd.print(n);  n = 1;
}