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#include <termios.h>
#include <unistd.h>
#include <stdio.h>
#include <iostream>
#include <string>
using namespace std;

int getch() {
    int ch;
    struct termios t_old, t_new;

    tcgetattr(STDIN_FILENO, &t_old);
    t_new = t_old;
    t_new.c_lflag &= ~(ICANON | ECHO);
    tcsetattr(STDIN_FILENO, TCSANOW, &t_new);

    ch = getchar();

    tcsetattr(STDIN_FILENO, TCSANOW, &t_old);
    return ch;
}

string getpass(const char *prompt, bool show_asterisk=true)
{
  const char BACKSPACE=127;
  const char RETURN=10;

  string password;
  unsigned char ch=0;

  cout <<prompt<<endl;

  while((ch=getch())!=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";

    string password = getpass("Please enter the password: ",true); // Show asterisks
    if(password == correct_password)
        cout << "Correct password" << endl;
    else
        cout << "Incorrect password. Try again" << endl;


    password = getpass("Please enter the password: ",false); // Do not show asterisks
    if(password == correct_password)
        cout << "Correct password" << endl;
    else
        cout << "Incorrect password. Try again" << endl;

  return 0;
}