// Zeinalipour-Yazti Demetrios
// csyiazti
// cs10xx -
// Lab Sec#24
// lab5
	/*
	 * This program reads in characters until the user enters the correct two-character sequence as a password.
	 * The password is "cs".  This password is used to open a door, let the user know when the door is open.
	 * The program simply keep reading characters until the proper password has been entered.
	 * The program will just wait for the user to type in more characters if the password has not been
	 * entered correctly yet.  If the password was entered correctly, it will output a statement saying
	 * "the door has been opened" and then the program will be finished.
     *
	 */
#include <iostream.h>


void main()
{
	/* The idea is to have 2 variables 
	 * input_prev = the previous character
	 * input = the current character
	 */
	char input_prev, input;

	cout << "Give me the password : ";	

	while (true)
	{
	  cin >> input;		  
	  
	  if ((input_prev=='c') && (input=='s'))
	  {
	     cout << "The door has been opened !\n"; 
		 break;
	  }

	  // keeping the current character as the previous character
	  input_prev = input; 

	}


}