You would like to verify the credentials of a user for your system. Listed next is a class named Security , which authenticates a user and password. (Note that this example is really not very secure. Typically passwords would be encrypted or stored in a database.)

class Security

{

public:

static int validate(string username, string password);

};

// This subroutine hard-codes valid users and is not

// considered a secure practice.

// It returns 0 if the credentials are invalid,

// 1 if valid user, and

// 2 if valid administrator

int Security::validate(string username, string password)

{

if ((username=="abbott") && (password=="monday")) return 1;

if ((username=="costello") && (password=="tuesday")) return 2;

return 0;

}

Break this class into two files, a file with the header Security.h and a file with the implementation Security.cpp.

Next, create two more classes that use the Security class by including the header file. The first class should be named Administrator and contain a function named Login that returns true if a given username and password have administrator clearance. The second class should be named User and contain a function named Login that returns true if a given username and password have either user or administrator clearance.

Both the User and Administrator classes should be split into separate files for the header and implementation.

Finally, write a main function that invokes the Login function for both the User and Administrator classes to test if they work properly. The main function should be in a separate file. Be sure to use the #ifndef directive to ensure that no header file is included more than once.