Having trouble fixing the error in my code checking the credentials to verify whether a person is an administrator or a user:

Undefined symbols for architecture x86_64: "Administrator::login(char const*, char const*)", referenced from: _main in main-dd2a50.o "User::login(char const*, char const*)", referenced from: _main in main-dd2a50.o ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation)

Code:

Security.h

#include

#include

using namespace std;

enum credentials {invalid, user, administrator};

class Security{

public:

static enum credentials

validate(const char *userName, const char *password);

};

Security.cpp

#include

#include

#include "Security.h"

enum credentials

Security::validate(const char *userName, const char *password)

{

if ((strcmp(userName, "abbott") == 0) &&

(strcmp(password, "monday") == 0)) {

return(user);

}

if ((strcmp(userName, "costello") == 0) &&

(strcmp(password, "tuesday") == 0)) {

return(administrator);

}

return(invalid);

}

Administrator.h

#include

#include

#include "Security.h"

using namespace std;

class Administrator

{

public:

static bool login(const char *username, const char *password);

};

Administrator.cpp

#include

#include

#include "Administrator.h"

#include "Security.h"

using namespace std;

bool Administrator::login(const char *username, const char *password)

{

if(Security::validate(username,password)==2){

return true;

}

else{

return false;

}

}

User.h

#include

#include "Security.h"

using namespace std;

class User

{

public:

static bool login(const char *username, const char *password);

};

User.cpp

#include

#include

#include "Security.h"

#include "User.h"

using namespace std;

bool User::login(const char *username, const char *password)

{

if (Security::validate(username,password)==1){

return true;

}

else {

return false;

}

}

Main.cpp

#include

#include

using namespace std;

#include "Administrator.h"

#include "User.h"

#include "Security.h"

char *progName;

int

main(int argc, char *argv[])

{

char *userName;

char *password;

if ((progName = strrchr(argv[0], '/')) == NULL) {

progName = argv[0];

} else {

++progName;

}

if (argc < 3) {

cerr << "usage: " << progName << " ";

return(1);

}

userName = argv[1];

password = argv[2];

cout << "Checking as Administrator:"

<< ((Administrator::login(userName,

password) == true) ? "" : " not")

<< " valid ";

cout << "Checking as User:"

<< ((User::login(userName, password) == true) ? "" : " not")

<< " valid ";

return(0);

}