#include <iostream.h>

class A

{

    public:

        A(int x)

        {

            cout<<"class A construing\t\t"<<x<<endl;

        }

        ~A()

        {

            cout<<"class A destroy"<<endl;

        }

};

class B

{

   public:

        B()

        {

            cout<<"class B construing\t\t"<<endl;

        }

//可以利用这种方式初始化私有变量

        B(int x):b(x)

        {

            //b=x;

            cout<<"class B construing\t\t"<<b<<endl;

        }

        ~B()

        {

            cout<<"class B destroying"<<endl;

        }

    private:

        int b;

};

class C

{

    public:

        C(int x,int y):a1(y)

        {

            cout<<"Class A with y ,C with xy construing, but B with nothing "<<x<<y<<endl;

        }

        C(int x,int a,int b);

        ~C()

        {

            cout<<"class C destroying"<<endl;

        }

        private:

            A a1;

            B b1;

};

C::C(int x,int a,int b):b1(b),a1(a)

{

    cout<<"class A B C construing"<<x<<a<<b<<endl;

}

int main()

{

    C c1(,);

    C c2(,,);

    return ;

}