C++ Implementation of Virtual Base Class

/*A demo program showing Virtual Base Class implementation*/

#include<iostream>
#include<cstdlib>
using namespace std;
class O
{
    public:
        int commonValue;
};
class A1:virtual public O
{
    public:
        A1()
        {
            commonValue=10;
        }
};
class B1:virtual public O
{
    public:
        B1()
        {
            commonValue=20;
        }
};
class C1:public A1,public B1
{
    public:
        void fx()
        {
            cout<<commonValue;//prints the value 20; Exchange the order of Inheritance A1 and B1 in C1; Output den wld b 10 
        }
};
int main()
{
    C1 see;
    see.fx();
    system("pause");
}

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