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  1.     #include <string>
  2.     #include <iostream>
  3.  
  4.     template <int attempts>
  5.     struct password_entry
  6.     {
  7.     	static bool get_entry(std::string& myusername, std::string& mypassword)
  8.     	{
  9.     		std::cout << "Enter your username: ";
  10.     		std::cin >> myusername;
  11.     		std::cout << "Enter your password: ";
  12.     		std::cin >> mypassword;
  13.     		if (myusername == "veasy62" && mypassword == "12")
  14.     		{
  15.     			std::cout << "Access granted veasy62" << std::endl;
  16.     			return true;
  17.     		}
  18.     		if ( attempts > 1 )
  19.     			std::cout << "Access denied.  You have " << attempts - 1 << " attempts remaining\n";
  20.     		return password_entry<attempts - 1>::get_entry(myusername, mypassword);
  21.     	}
  22.     };
  23.  
  24.     template <> 
  25.     struct password_entry<0>
  26.     {
  27.     	static bool get_entry(const std::string& /*myusername*/, const std::string& /*mypassword*/)
  28.     	{
  29.     		std::cout << "Sorry you have ran out of attempts\n";
  30.     		return false;
  31.     	}
  32.     };
  33.  
  34.  
  35.     int main()
  36.     {
  37.     	std::string mypass, myuser;
  38.  
  39.         // max 2 attempts 
  40.     	bool access_granted = password_entry<2>::get_entry(myuser, mypass);
  41.     	if ( access_granted )
  42. 	       std::cout << "Welcome current user";
  43. 	    else
  44. 	       std::cout << "Please call 555-5555 to reset your password";
  45.     }
  46.  
  47.  
Success #stdin #stdout 0s 3476KB
comments (?)
stdin
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nogood
10
veasy62
12
stdout
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Enter your username: Enter your password: Access denied.  You have 1 attempts remaining
Enter your username: Enter your password: Access granted veasy62
Welcome current user
https://ideone.com/hQFLGS
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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