OOP Basic–Is the class declaration right?[const]

Q:

in C++ programming language, Is it right to define a class as the following shown:
class A{

const int Size=0;

}


A:
no, it's wrong!
在C++中，這樣是錯誤的，常量成員的初始化必須在建構函式中完成。
the initiation of const must be intialized in construct function. so the right codes should be following:

    class A

            {

               public  A()

                {

                const int Size=0;

                }

            }


comments:

However, it's not true with C#. with C#, we should exactly code like this:

但是，在C#中，這樣是正確的，常量必須在聲明的時候同時初始化。因為其在compile-time時候分配heap memory.
class A{

const int Size=0;

}

相反，像C++那種寫法還是錯誤的！所以一定要分清楚
Do not be confused!!!!