Dev - C++ - Contraseña en Dev c++

#include <iostream>

#include <string>

#include <windows.h>

using namespace std;

string getpass ( const char *prompt, bool show_asterisk = true ) {

    const char BACKSPACE = 8;

    const char RETURN = 13;

    string password;

    unsigned char ch = 0;

    cout << prompt << endl;

    DWORD con_mode;

    DWORD dwRead;

    HANDLE hIn = GetStdHandle ( STD_INPUT_HANDLE );

    GetConsoleMode ( hIn, &con_mode );

    SetConsoleMode ( hIn, con_mode & ~ ( ENABLE_ECHO_INPUT | ENABLE_LINE_INPUT ) );

    while ( ReadConsoleA ( hIn, &ch, 1, &dwRead, NULL ) && ch != RETURN ) {

        if ( ch == BACKSPACE ) {

            if ( password.length() != 0 ) {

                if ( show_asterisk )

                    cout << "\b \b";

                password.resize ( password.length() - 1 );

            }

        } else {

            password += ch;

            if ( show_asterisk )

                cout << '*';

        }

    }

    cout << endl;

    return password;

}

int main() {

    const char *correct_password = "null";  // <- "null" es la contrasenha de prueba, si pones otra cosa fallará. ;)

    cout << "Teste 1: Asteriscos activados" << endl;

    string password = getpass ( "Por favor entre con el password: ", true ); // true muestra los asteriscos

    if ( password == correct_password )

        cout << "Password correcto" << endl;

    else

        cout << "Password incorrecto. Intente nuevamente" << endl;

    cout << "\nTeste 2: Asteriscos desactivados" << endl;

    password = getpass ( "Por favor entre con el password: ", false ); // false no muestra los asteriscos

    if ( password == correct_password )

        cout << "Password correcto" << endl;

    else

        cout << "Password incorrecto. Lo siento, fallaste." << endl;

    return 0;

}