有关析构函数的调用顺序的新疑问！！！！！！help

Question

显然和你class d:public b ,public c，这个顺序有关

Answer 1

问题是virtual public c这样继承的话结果怎样解释？

Answer 2

我把我的程序贴出来，供大家看看，你的程序我编译都通不过。                       #include "iostream.h"
                        class a{
                        public:
                          ~a(){cout<<"a-";}
                          a(){cout<<"a+";}
                        };
                        
                        class b:virtual public a{
                        public:
                          ~b(){cout<<"b-";}
                          b(){cout<<"b+";}
                        };
                        
                        class c:virtual public a{
                        public:
                          ~c(){cout<<"c-";}
                          c(){cout<<"c+";}
                        };
                        
                        class d: public b , public c
                        //如果写成public b,virtual public c的话结果变成-----:  d b c a 
                        {                               
                        //为什么！！！！？？？？
                        public:
                          ~d(){cout<<"d-";}
                          d(){cout<<"d+";}
                        };
                        
                        void main()
                        {
                        d ning;
                        }