Arduino LCD 1

#include <LiquidCrystal.h>

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

String pass = "1234";
const int debounceTime = 10;
const byte pinLED = 6;
const byte buzzer = A5;
const byte ROWS = 4; // Four rows
const byte COLS = 3; // Three columns
// Define the Keymap
const char keys[ROWS][COLS] = {
  {'3','2','1'},
  {'6','5','4'},
  {'9','8','7'},
  {'E','0','B'}
};
char password[4] = {'1','2','3','4'};
char buff[4] = {'-','-','-','-'};
boolean correct = true;
int cur = 0;

// Connect keypad ROW0, ROW1, ROW2 and ROW3 to these Arduino pins.
byte rowPins[ROWS] = { A1, A2, A3, A4 };//A1 error
// Connect keypad COL0, COL1 and COL2 to these Arduino pins.
byte colPins[COLS] = { 7, 8, 9 };


void setup()
{
  lcd.begin(16,2);
  pinMode(buzzer,OUTPUT);
  pinMode(pinLED,OUTPUT);
  //Serial.begin(9600);
   for (int row = 0; row < ROWS; row++)
  {
    pinMode(rowPins[row],INPUT);       // Set row pins as input
    digitalWrite(rowPins[row],HIGH);   // turn on Pull-ups
  }
  for (int column = 0; column < COLS; column++)
  {
    pinMode(colPins[column],OUTPUT);     // Set column pins as outputs
    digitalWrite(colPins[column],HIGH);  // Make all columns inactive
  }
   lcd.print("Enter Password");
   lcd.setCursor(0, 1);
   lcd.print("Pass : ");

}

char getKey()
{
  char key = 0;                                  // 0 indicates no key pressed

  for(int column = 0; column < COLS; column++)
  {
    digitalWrite(colPins[column],LOW);         // Activate the current column.
    for(int row = 0; row < ROWS; row++)     // Scan all rows for
                                               // a key press.
    {
      if(digitalRead(rowPins[row]) == LOW)     // Is a key pressed?
      {
        delay(debounceTime);                   // debounce
        while(digitalRead(rowPins[row]) == LOW)
            ;                                  // wait for key to be released
        key = keys[row][column];             // Remember which key
                                               // was pressed.
      }
    }
    digitalWrite(colPins[column],HIGH);     // De-activate the current column.
  }
  return key;  // returns the key pressed or 0 if none
}

void loop()
{
  char key = getKey();
  if(key)  // Check for a valid key.
  {
    digitalWrite(buzzer,HIGH);
    delay(50);
    switch (key)
    {
      case 'E':
        correct=true;
        for(int i=0;i<4;i++)
         {
          if (buff[i] != password[i])
           {
             correct = false;
           }
         }
        lcd.clear();
        lcd.setCursor(0, 0);
        if(correct==true)
          {

            lcd.print("Correct!!");
            Serial.println("Correct");
            digitalWrite(pinLED,HIGH);
          }
        else
          {
            lcd.print("Incorrect!!");
            Serial.println("Incorrect");
          }
          for(int i=0;i<4;i++)
           {
             buff[i]='-';
           }
          cur = 0;
           delay(500);
        Serial.println(key);
        break;
      case 'B':
        if(cur>=1)
          {
           cur = cur -1;
           buff[cur]='-';
          }
          Serial.println("Back");
        break;
      default:
        if(cur<4)
         {
          buff[cur]=key;
          cur=cur+1;
          Serial.println(key);
         }
        else
         {
          Serial.println("Full") ;
         }

      }

        for(int i=0;i<4;i++)
        Serial.print(buff[i]);
        Serial.print(" cur ");
        Serial.println(cur);
        lcd.setCursor(0, 0);
        lcd.print("Enter Password");
        lcd.setCursor(0, 1);
        lcd.print("Pass : ");
        for(int i=0;i<cur;i++)
        {lcd.print('*');}
        for(int i=cur;i<4;i++)
        {lcd.print(' ');}
  }
  else
   {
        digitalWrite(pinLED,LOW);
        digitalWrite(buzzer,LOW);
   }
}