error LNK2019: unresolved external symbol referenced in function _main visual c++

Question

Does anyone have any ideas on how to fix this? I've looked online and changed settings on my visual C++, but it still doesn't work.

class store { public: int MainMenu(); store(); private: int main; }; class customer:store { public: int CustomerMenu(); customer(); private: int cmenu; }; class employee:store { public: int EmployeeMenu(); employee(); private: int emenu; }; int main() { int main; store a; customer b; employee c; a.MainMenu(); if(main = 1) { c.EmployeeMenu(); } else if(main = 2) { b.CustomerMenu(); } else { exit(EXIT_SUCCESS); } } int MainMenu() { int main; cout << "Choose an option: " << endl; cout << " 1. Administration menu" << endl; cout << " 2. Customer menu" << endl; cout << " 3. Exit the program" << endl; cin >> main; return main; } int CustomerMenu() { int cmenu; cout << " 1. Search Video" << endl; cout << " 2. View Video Titles" << endl; cout << " 3. Rent Video" << endl; cout << " 4. Exit to the Main Menu" << endl; cout << " 5. Exit the program" << endl; cin >> cmenu; return cmenu; } int EmployeeMenu() { int emenu; cout << " 1. Store Information menu" << endl; cout << " 2. Merchandise Information menu" << endl; cout << " 3. Category Information menu" << endl; cout << " 4. Customer Information menu" << endl; cout << " 5. Employee Information menu" << endl; cout << " 6. Rent a Video" << endl; cout << " 7. Restock Video" << endl; cout << " 8. Sales menu" << endl; cout << " 9. Exit to Main Menu" << endl; cout << " 10. Exit the program" << endl; cin >> emenu; return emenu; } store::store() { main = 0; } customer::customer() { cmenu = 0; } employee::employee() { emenu = 0; }

It gives me:

Store.obj : error LNK2019: unresolved external symbol "public: int __thiscall customer::CustomerMenu(void)" (?CustomerMenu@customer@@QAEHXZ) referenced in function _main 1>Store.obj : error LNK2019: unresolved external symbol "public: int __thiscall employee::EmployeeMenu(void)" (?EmployeeMenu@employee@@QAEHXZ) referenced in function _main 1>Store.obj : error LNK2019: unresolved external symbol "public: int __thiscall store::MainMenu(void)" (?MainMenu@store@@QAEHXZ) referenced in function _main

not to mention if (main = 1) will always be true. you mean ==. — Elazar
– Elazar, Commented Jun 2, 2013 at 21:15

Joachim Isaksson · Accepted Answer · 2013-06-02 21:16:24Z

You're implementing CustomerMenu() and EmployeeMenu() as normal functions, not class members. The implementaitons should be;

int customer::CustomerMenu() { ... int employee::EmployeeMenu() { ...

Carl Norum · Accepted Answer · 2013-06-02 21:16:29Z

Your member function implementations need to be defined correctly. For example:

int CustomerMenu()

Should be:

int customer::CustomerMenu(void)

And so forth.

taocp · Accepted Answer · 2013-06-02 21:32:41Z

if(main = 1) { //^^should be ==, same as the one below c.EmployeeMenu(); } else if(main = 2) { b.CustomerMenu(); }

Member functions should be defined with scope resolution operator:

int CustomerMenu()

should be:

int Customer::ustomerMenu()

Minor point:

class employee:store

Here you used private inheritance, you really need to think about whether you need it or not.

(The OP is novice. Obviously he doesn't need private inheritance.) the syntax should be class employee : public store. but it sounds unlikely that an employee will inherit from store.
Thanks to both of you for your input. As Elazar stated I am a beginner.

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