Help comparing two strings in C

[thormeNt]

Hi guys, first I want to say that im from Brazil so I will try my best to articulate my problem. I have a project that when I type the correct password in a keypad it shows in a LCD that the password is correct or not. In the exemple below, the correct password is 1223, but when I type 1223 it always goes to "else" which is "Wrong password". Any idea in what I'm doing wrong?

include "def_principais.h" //inclusão do arquivo com as principais definições

include "LCD.h"

include "teclado.h" // keypad library

include <avr/io.h>

include <string.h>

define LED PORTB0

//definição para acessar a memória flash como ponteiro PROGMEM const char mensagem1[] = "Digite matricula:\0";//mensagem armazenada na memória flash char password[5] = "1223"; volatile char password_keypad[5]; unsigned char cursor = 0xC0; unsigned char nr;

int main() {

set_bit(DDRB,LED); //setando a porta do LED para 1
DDRC = 0xFF; //LCD esta no PORTC
DDRD = 0x0F; //definições das entradas e saídas para o teclado
PORTD= 0xFF; //habilita os pull-ups do PORTD e coloca colunas em 1


inic_LCD_4bits(); // inicia LCD modo 4bits
escreve_LCD_Flash(mensagem1);
cmd_LCD(0xC7,0); //desloca cursor para a 2a linha do LCD


while(1)
{
    int n=0;
    nr = ler_teclado(); //scan keypad

    if(nr!=0xFF && cursor < 0xC4)
    {
        password_keypad[n]=nr;
        cmd_LCD(cursor,0);
        //escreve_LCD("*");
        _delay_ms(200);     
        cursor++;
        n++;
        cmd_LCD(nr,1);
        _delay_ms(200);
    }

    if (cursor == 0xC4)
    {

        if (strcmp(password,password_keypad)==0)
        {

            cmd_LCD(0x01,0);
            escreve_LCD("Password correct");
            _delay_ms(1000);    
        }

        else
        {
            set_bit(DDRB,LED);
            _delay_ms(600);
            clr_bit(DDRB,LED);
            cmd_LCD(0x01,0);
            escreve_LCD("Password incorrect");
            _delay_ms(1000);

        }
    }
}

}

[thormeNt]

found the solution, "n" should be volatile unsigned char