#include <Keypad.h>
#include <LiquidCrystal.h>

LiquidCrystal lcd(12, 11, 10, 9, 8, 7); 

const byte ROWS = 4;
const byte COLS = 3;

char keys[ROWS][COLS] = {
  { '1', '2', '3' },
  { '4', '5', '6' },
  { '7', '8', '9' },
  { '*', '0', '#' }
};

byte colPins[COLS] = {4,5,6}; // Pins connected to C1, C2, C3, C4
byte rowPins[ROWS] = {0,1,2,3}; // Pins connected to R1, R2, R3, R4
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

String x = "";

void setup() {
  lcd.begin(16,2);
  lcd.setCursor(0, 0);
}

void loop() {
  // put your main code here, to run repeatedly:
  char key = keypad.getKey();
  if ((key != NO_KEY) && (key != "#") && (key != "*")){
    x += key;
    lcd.print(x);
  }
  lcd.setCursor(0,0);
}


//It seems that as the code gets more complicated, the check method should be 
//programmed in a more complicated way as well in order to solve the judgetime issue