错误LNK2019：函数中引用的无法解析的外部符号_main visual C++

有没有人有关于如何解决此问题的任何想法？我在网上查看并更改了我的Visual C++设置，但它仍然无效。错误LNK2019：函数中引用的无法解析的外部符号_main visual C++

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; 
}

它给我：

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

来源

2013-06-02 Tiffany

为什么你有一个名为'main'的变量？ – Elazar

更不用说'if（main = 1）'永远是真的。你的意思是'=='。 – Elazar

您正在实施CustomerMenu()和EmployeeMenu()作为正常功能，而不是类成员。实施应该是;

int customer::CustomerMenu() 
{ 
... 

int employee::EmployeeMenu() 
{ 
...

来源

2013-06-02 21:16:24

非常感谢！ – Tiffany

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

成员函数应具有范围解析操作符来定义：

int CustomerMenu()

应该是：

int Customer::ustomerMenu()

小点：

class employee:store

在这里，您使用private inheritance，你真的需要想想你是否需要与否。

来源

2013-06-02 21:16:04 taocp

（OP是新手，显然他*不需要私有继承。）语法应该是'class employee：public store'。但'雇员'从'store'继承是不太可能的。 – Elazar

@Elazar我完全同意你的看法。 – taocp

感谢你们双方的意见。正如Elazar声称我是初学者。 – Tiffany

您的成员函数实现需要正确定义。例如：

int CustomerMenu()

应该是：

int customer::CustomerMenu(void)

等等。

来源

2013-06-02 21:16:29

错误LNK2019：函数中引用的无法解析的外部符号_main visual C++

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