虚拟继承中子类和父类的构造函数顺序1

class A{
protected://不能写private
	int a;
public:
	A(int x) :a(x){}
};

class B:virtual public A
{

public:
	B(int x) :A(x){}
};

class C :virtual public A
{
public:
	C(int x) :A(x){}
	void display()
	{
		cout <