Memasuki menu ATM dengan C++

 #Program C++ nya :

#include <cstdlib>
#include <iostream>

using namespace std;

int main(int argc, char *argv[])
{
    int username,password;
    int a;
    cout<<"WELCOME IN ATM"<<endl;
    cout<<endl;
    int user = 0000;
    int pass = 1234;
   
    a=1;
    do{
        cout<<"Masukka Username Anda = ";cin>>username;
        cout<<"Masukkan Password Anda = ";cin>>password;
        if (username==user&&password==pass){
                                        cout<<"Anda masuk di ATM"<<endl;
                                        }else{
                                              cout<<"Username dan Password yang anda masukkan salah, silahkan coba lagi"<<endl;
                                              a=a+1;
                                              }}
        while (a<=3);
        cout<<"ATM ANDA TERBLOKIR !!! Segera Hubungi Customer Service !!!"<<endl;
    system("PAUSE");
    return EXIT_SUCCESS;
}